Update CI action versions

Author: mattpolzin

.github/workflows/tests.yml

@@ -36,19 +36,20 @@ jobs:
           - swift:5.6-bionic
           - swift:5.6-focal
           - swift:5.6-amazonlinux2
+          - swift:5.7-jammy
     container: ${{ matrix.image }}
     steps:
     - name: Checkout code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Run tests
       run: swift test --enable-test-discovery
   osx:
     runs-on: macOS-latest
     steps:
       - name: Select latest available Xcode
-        uses: maxim-lobanov/setup-xcode@v1.2.1
+        uses: maxim-lobanov/setup-xcode@v1
         with: { 'xcode-version': 'latest' }
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Run tests
         run: swift test --enable-test-discovery