Bump haskell-actions/setup in /.github/actions/setup-build

Bumps [haskell-actions/setup](https://github.com/haskell-actions/setup) from 2.7.5 to 2.7.6.
- [Release notes](https://github.com/haskell-actions/setup/releases)
- [Commits](haskell-actions/setup@v2.7.5...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] <[email protected]>

Author: dependabot[bot]

.github/actions/setup-build/action.yml

@@ -31,7 +31,7 @@ runs:
         sudo chown -R $USER /usr/local/.ghcup
       shell: bash
 
-    - uses: haskell-actions/[email protected].5
+    - uses: haskell-actions/[email protected].6
       id: HaskEnvSetup
       with:
         ghc-version  : ${{ inputs.ghc   }}