maint: bump ansys/actions from 6 to 7 (#489)

Bumps [ansys/actions](https://github.com/ansys/actions) from 6 to 7.
- [Release notes](https://github.com/ansys/actions/releases)
- [Commits](ansys/actions@v6...v7)

---
updated-dependencies:
- dependency-name: ansys/actions
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci_cd.yml

@@ -29,7 +29,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: "Check documentation style"
-        uses: ansys/actions/doc-style@v6
+        uses: ansys/actions/doc-style@v7
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
 
@@ -47,7 +47,7 @@ jobs:
           sudo apt-get install graphviz
 
       - name: "Build project documentation"
-        uses: ansys/actions/doc-build@v6
+        uses: ansys/actions/doc-build@v7
         with:
           python-version: ${{ env.MAIN_PYTHON_VERSION }}
           use-python-cache: false
@@ -83,7 +83,7 @@ jobs:
     needs: doc-deploy
     steps:
       - name: "Deploy the latest documentation index"
-        uses: ansys/actions/doc-deploy-index@v6
+        uses: ansys/actions/doc-deploy-index@v7
         with:
           cname: ${{ env.DOCUMENTATION_CNAME }}
           index-name: "pyansys-dev-guide"