formatter action: use v3 instead of master

Author: Maximilian-Stefan-Ernst

.github/workflows/FormatCheck.yml

@@ -7,4 +7,7 @@ jobs:
   code-style:
     runs-on: ubuntu-latest
     steps:
-    - uses: julia-actions/julia-format@master
+      - uses: julia-actions/julia-format@v3
+        with:
+          version: '1'
+          suggestion-label: 'format-suggest'