Use Checkout v3 (#143)

Author: jraska

.github/workflows/build.yml

@@ -5,6 +5,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout the code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Run Tests
         run: ./gradlew check --stacktrace

.github/workflows/release.yml

@@ -13,6 +13,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout the code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Publish Release
         run: ./gradlew publishReleasePublicationToSonatypeRepository --stacktrace