Bump actions/stale from 10.4.0 to 11.0.0 (#4581)

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

Author: dependabot[bot]

.github/workflows/stale.yml

@@ -12,7 +12,7 @@ jobs:
     if: "github.repository == 'ESMValGroup/ESMValTool'"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/stale@1e223db275d687790206a7acac4d1a11bd6fe629 # v10.4.0
+      - uses: actions/stale@4391f3da665fdf50b6810c1a66712fb9ba21aa93 # v11.0.0
         with:
           days-before-issue-stale: 1080
           days-before-pr-stale: 360