[CI] Bump haskell-actions/setup from 2.7.4 to 2.7.6

Bumps [haskell-actions/setup](https://github.com/haskell-actions/setup) from 2.7.4 to 2.7.6.
- [Release notes](https://github.com/haskell-actions/setup/releases)
- [Commits](haskell-actions/setup@v2.7.4...v2.7.6)

---
updated-dependencies:
- dependency-name: haskell-actions/setup
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci.yml

@@ -40,7 +40,7 @@ jobs:
           ghc: 'latest'
     steps:
     - uses: actions/checkout@v4
-    - uses: haskell-actions/setup@v2.7.4
+    - uses: haskell-actions/setup@v2.7.6
       id: setup-haskell-cabal
       with:
         ghc-version: ${{ matrix.ghc }}