fix ci yaml matrix format

Author: cosmicexplorer

.github/workflows/ci.yaml

@@ -92,13 +92,14 @@ jobs:
       - name: fmt
         run: cargo fmt --all -- --check
       - name: fmt fuzz
-        run: cargo fmt --manifest-path ${{ github.workspace }}/fuzz/Cargo.toml -- --check
+        run: cargo fmt --all --manifest-path ${{ github.workspace }}/fuzz/Cargo.toml -- --check
 
   check_minimal_versions:
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
-    matrix:
-      # Only check minimal versions for the released library.
-      workspace: ['Cargo.toml']
+    strategy:
+      matrix:
+        # Only check minimal versions for the released library.
+        workspace: ['Cargo.toml']
     runs-on: ubuntu-latest
 
     steps: