Changed to ubuntu-latest

Author: osugikoji

.github/workflows/main-ci.yml

@@ -43,7 +43,7 @@ jobs:
 
   code-coverage:
     name: Code Coverage
-    runs-on: macos-11
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v3

.github/workflows/publish.yml

@@ -11,7 +11,7 @@ env:
 jobs:
   publish-maven:
     name: Publish to Maven
-    runs-on: macos-11
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v3