Upgrade to latest builder OSes

Author: chuckhoupt

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ on:
 jobs:
 
   Linux:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     env:
       BUNDLE_PATH:  ~/.gem
     steps:
@@ -17,7 +17,7 @@ jobs:
      - run: CFLAGS=-m32 ./cibuild
 
   Windows:
-    runs-on: windows-2019
+    runs-on: windows-latest
     steps:
      - uses: actions/checkout@v3
      - uses: ruby/setup-ruby@v1