MAINT: Bump ansys/actions from 4 to 8

Bumps [ansys/actions](https://github.com/ansys/actions) from 4 to 8.
- [Release notes](https://github.com/ansys/actions/releases)
- [Commits](ansys/actions@v4...v8)

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

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

.github/workflows/ci_cd.yml

@@ -342,7 +342,7 @@ jobs:
     needs: doc-deploy-dev
     steps:
       - name: "Deploy the latest documentation index"
-        uses: ansys/actions/doc-deploy-index@v4
+        uses: ansys/actions/doc-deploy-index@v8
         with:
           cname: ${{ env.DOCUMENTATION_CNAME }}/version/dev
           index-name: pyaedt-toolkits-common-vdev
@@ -382,7 +382,7 @@ jobs:
           echo "VERSION_MEILI=$VERSION_MEILI" >> $GITHUB_ENV
 
       - name: "Deploy the latest documentation index"
-        uses: ansys/actions/doc-deploy-index@v4
+        uses: ansys/actions/doc-deploy-index@v8
         with:
           cname: ${{ env.DOCUMENTATION_CNAME }}/version/${{ env.VERSION }}
           index-name: pyaedt-toolkits-common-v${{ env.VERSION_MEILI }}