Use fail-fast: false in CI

Author: eregon

.github/workflows/test.yml

@@ -13,6 +13,7 @@ jobs:
     needs: ruby-versions
     name: test (${{ matrix.ruby }} / ${{ matrix.os }})
     strategy:
+      fail-fast: false
       matrix:
         ruby: ${{ fromJson(needs.ruby-versions.outputs.versions) }}
         os: [ ubuntu-latest, macos-latest, windows-latest ]