Fixes for ubuntu-22.04

Author: sinoru

.github/workflows/tests.yml

@@ -17,8 +17,8 @@ jobs:
     runs-on: ${{ matrix.operating-system }}
     strategy:
       matrix:
-        operating-system: ["ubuntu-18.04", "ubuntu-20.04", "ubuntu-22.04", "macos-10.15", "macos-11", "macos-12"]
-        swift-version: ["5.3.3", "5.4.3", "5.5.3", "5.6.1"]
+        operating-system: ["ubuntu-18.04", "ubuntu-20.04", "macos-10.15", "macos-11", "macos-12"]
+        swift-version: ["5.3.3", "5.4.3", "5.5.3", "5.6.3", "5.7.1"]
         include:
           - operating-system: "ubuntu-18.04"
             swift-version: "5.0.3"
@@ -32,6 +32,8 @@ jobs:
             swift-version: "5.1.5"
           - operating-system: "macos-10.15"
             swift-version: "5.2.5"
+          - operating-system: "ubuntu-22.04"
+            swift-version: "5.7.1"
     steps:
       - uses: actions/checkout@v3
       - uses: ./