fix: JSII_RUNTIME_PACKAGE_CACHE improper case bug (#3912)

Fix bug where cached enabled is always false.
fixes #3911

It took me a good 4 minutes to figure out that the PR title needs a to be prefixed with `fix:` including the colon 😄 

---

By submitting this pull request, I confirm that my contribution is made under the terms of the [Apache 2.0 license].

[Apache 2.0 license]: https://www.apache.org/licenses/LICENSE-2.0

Author: Ragnoroct

.all-contributorsrc

@@ -1522,6 +1522,15 @@
       "contributions": [
         "bug"
       ]
+    },
+    {
+      "login": "Ragnoroct",
+      "name": "Will Bender",
+      "avatar_url": "https://avatars.githubusercontent.com/u/19155205?v=4",
+      "profile": "https://github.com/Ragnoroct",
+      "contributions": [
+        "bug"
+      ]
     }
   ],
   "repoType": "github",

README.md

@@ -228,32 +228,33 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     </tr>
     <tr>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/Lanayx"><img src="https://avatars2.githubusercontent.com/u/3329606?v=4?s=100" width="100px;" alt="Vladimir Shchur"/><br /><sub><b>Vladimir Shchur</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3ALanayx+label%3Abug" title="Bug reports">🐛</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/Ragnoroct"><img src="https://avatars.githubusercontent.com/u/19155205?v=4?s=100" width="100px;" alt="Will Bender"/><br /><sub><b>Will Bender</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3ARagnoroct+label%3Abug" title="Bug reports">🐛</a></td>
       <td align="center" valign="top" width="14.28%"><a href="http://yanex.org/"><img src="https://avatars2.githubusercontent.com/u/95996?v=4?s=100" width="100px;" alt="Yan Zhulanow"/><br /><sub><b>Yan Zhulanow</b></sub></a><br /><a href="https://github.com/aws/jsii/commits?author=yanex" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/yglcode"><img src="https://avatars.githubusercontent.com/u/11893614?v=4?s=100" width="100px;" alt="Yigong Liu"/><br /><sub><b>Yigong Liu</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Ayglcode+label%3Abug" title="Bug reports">🐛</a> <a href="https://github.com/aws/jsii/issues?q=author%3Ayglcode+label%3Afeature-request" title="Feature requests">🤔</a></td>
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-      <td align="center" valign="top" width="14.28%"><a href="https://github.com/arnogeurts-sqills"><img src="https://avatars.githubusercontent.com/u/79304871?v=4?s=100" width="100px;" alt="arnogeurts-sqills"/><br /><sub><b>arnogeurts-sqills</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Aarnogeurts-sqills+label%3Abug" title="Bug reports">🐛</a> <a href="https://github.com/aws/jsii/commits?author=arnogeurts-sqills" title="Code">💻</a></td>
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+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/arnogeurts-sqills"><img src="https://avatars.githubusercontent.com/u/79304871?v=4?s=100" width="100px;" alt="arnogeurts-sqills"/><br /><sub><b>arnogeurts-sqills</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Aarnogeurts-sqills+label%3Abug" title="Bug reports">🐛</a> <a href="https://github.com/aws/jsii/commits?author=arnogeurts-sqills" title="Code">💻</a></td>
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-      <td align="center" valign="top" width="14.28%"><a href="https://github.com/guyroberts21"><img src="https://avatars.githubusercontent.com/u/47118902?v=4?s=100" width="100px;" alt="guyroberts21"/><br /><sub><b>guyroberts21</b></sub></a><br /><a href="https://github.com/aws/jsii/commits?author=guyroberts21" title="Documentation">📖</a></td>
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+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/guyroberts21"><img src="https://avatars.githubusercontent.com/u/47118902?v=4?s=100" width="100px;" alt="guyroberts21"/><br /><sub><b>guyroberts21</b></sub></a><br /><a href="https://github.com/aws/jsii/commits?author=guyroberts21" title="Documentation">📖</a></td>
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-      <td align="center" valign="top" width="14.28%"><a href="https://github.com/vaneek"><img src="https://avatars1.githubusercontent.com/u/8113305?v=4?s=100" width="100px;" alt="vaneek"/><br /><sub><b>vaneek</b></sub></a><br /><a href="https://github.com/aws/jsii/issues?q=author%3Avaneek+label%3Abug" title="Bug reports">🐛</a></td>
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   </tbody>

packages/@jsii/kernel/src/tar-cache/index.ts

@@ -24,7 +24,7 @@ export interface ExtractResult {
 }
 
 let packageCacheEnabled =
-  process.env.JSII_RUNTIME_PACKAGE_CACHE?.toLocaleUpperCase() === 'enabled';
+  process.env.JSII_RUNTIME_PACKAGE_CACHE?.toLocaleLowerCase() === 'enabled';
 
 /**
  * Extracts the content of a tarball, possibly caching it on disk.