Disable fail-fast for external type check

If one OS fails, doesn't mean it will fail for the others.

Author: Thomasdezeeuw

.github/workflows/main.yml

@@ -123,6 +123,7 @@ jobs:
     name: check-external-types (${{ matrix.os }})
     runs-on: ${{ matrix.os }}
     strategy:
+      fail-fast: false
       matrix:
         os:
           - windows-latest