chore(deps): update actions/checkout action to v6 (#514)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://redirect.github.com/actions/checkout) |
action | major | `v5` -> `v6` |

---

### Release Notes

<details>
<summary>actions/checkout (actions/checkout)</summary>

### [`v6`](https://redirect.github.com/actions/checkout/compare/v5...v6)

[Compare
Source](https://redirect.github.com/actions/checkout/compare/v5...v6)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "every weekday" (UTC), Automerge - At
any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

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View the [repository job
log](https://developer.mend.io/github/apify/apify-sdk-js).

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.github/workflows/docs.yaml

@@ -18,7 +18,7 @@ jobs:
         runs-on: ubuntu-22.04
 
         steps:
-            - uses: actions/checkout@v5
+            - uses: actions/checkout@v6
               with:
                   token: ${{ secrets.APIFY_SERVICE_ACCOUNT_GITHUB_TOKEN }}
             - name: Use Node.js 24

.github/workflows/release-generic-actors.yaml

@@ -96,7 +96,7 @@ jobs:
                       development-build-tag: development
                       should-build: ${{ github.event.inputs.camoufox-scraper }}
         steps:
-            - uses: actions/checkout@v5
+            - uses: actions/checkout@v6
 
             - name: Log matrix
               run: |

.github/workflows/release.yaml

@@ -51,7 +51,7 @@ jobs:
                   access_token: ${{ github.token }}
 
             - name: Checkout repository
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - name: Use Node.js ${{ matrix.node-version }}
               uses: actions/setup-node@v6
@@ -88,7 +88,7 @@ jobs:
 
         steps:
             - name: Checkout repository
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
               with:
                   token: ${{ secrets.APIFY_SERVICE_ACCOUNT_GITHUB_TOKEN }}
                   fetch-depth: 0

.github/workflows/test-and-release.yaml

@@ -36,7 +36,7 @@ jobs:
                   access_token: ${{ github.token }}
 
             - name: Checkout repository
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - name: Use Node.js ${{ matrix.node-version }}
               uses: actions/setup-node@v6
@@ -71,7 +71,7 @@ jobs:
         runs-on: ubuntu-22.04
         steps:
             - name: Checkout Source code
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - name: Use Node.js 24
               uses: actions/setup-node@v6
@@ -105,7 +105,7 @@ jobs:
 
         steps:
             - name: Checkout repository
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - name: Use Node.js 24
               uses: actions/setup-node@v6
@@ -139,7 +139,7 @@ jobs:
         needs: [lint, build_and_test]
         steps:
             - name: Checkout Source code
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
               with:
                   fetch-depth: 0 # we need to pull everything to have correct dev version suffix
                   ref: master

.github/workflows/test-e2e.yaml

@@ -22,7 +22,7 @@ jobs:
                   access_token: ${{ github.token }}
 
             - name: Checkout repository
-              uses: actions/checkout@v5
+              uses: actions/checkout@v6
 
             - name: Use Node.js 24
               uses: actions/setup-node@v6