Merge pull request #380 from olleolleolle/ci-yaml-quotes

CI: use "3.0" to avoid YAML float conversions

Author: hsbt

.github/workflows/macos.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: macos-latest
     strategy:
       matrix:
-        ruby: [ 3.0, 2.7, 2.6, ruby-head ]
+        ruby: [ '3.0', 2.7, 2.6, ruby-head ]
     steps:
     - uses: actions/checkout@v2
     - uses: ruby/setup-ruby@v1

.github/workflows/windows.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: windows-latest
     strategy:
       matrix:
-        ruby: [ 3.0, 2.7, 2.6, ruby-head ]
+        ruby: [ '3.0', 2.7, 2.6, ruby-head ]
     steps:
     - uses: actions/checkout@v2
     - uses: ruby/setup-ruby@v1