Bump gap-actions/setup-gap from 2 to 3

Bumps [gap-actions/setup-gap](https://github.com/gap-actions/setup-gap) from 2 to 3.
- [Commits](gap-actions/setup-gap@v2...v3)

---
updated-dependencies:
- dependency-name: gap-actions/setup-gap
  dependency-version: '3'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -67,7 +67,7 @@ jobs:
         uses: actions/checkout@v5
         with:
           path: this-action/
-      - uses: gap-actions/setup-gap@v2
+      - uses: gap-actions/setup-gap@v3
         with:
           GAP_PKGS_TO_BUILD: ''
       - uses: gap-actions/build-pkg@v1
@@ -129,7 +129,7 @@ jobs:
         uses: actions/checkout@v5
         with:
           path: this-action/
-      - uses: gap-actions/setup-gap@v2
+      - uses: gap-actions/setup-gap@v3
         with:
           GAP_PKGS_TO_BUILD: ''
       - uses: gap-actions/build-pkg@v1