rake.yml in jekyll-plantuml-1.4.2

- old
+ new

@@ -10,14 +10,14 @@
 jobs:
   test:
     name: test
     strategy:
       matrix:
-        os: [ubuntu-20.04, macos-12]
+        os: [ubuntu-20.04]
         ruby: [2.7, 3.2]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
       - run: sudo apt-get -y install plantuml
       - run: bundle update