Use GitHub's dedicated self-repository syntax for spellcheck.uses in update-and-build

Author: m-aciek

.github/workflows/update-and-build.yml

@@ -78,7 +78,7 @@ jobs:
     if: github.event_name == 'schedule' || github.ref_name == github.event.repository.default_branch
     permissions:
       contents: read
-    uses: ./.github/workflows/spellcheck.yml
+    uses: $/.github/workflows/spellcheck.yml
     with:
       version: ${{ github.ref_name }}
       translations-ref: ${{ github.ref_name }}