use ubuntu-22.04 instead of ubuntu-latest for tests

Author: Skgland

.github/workflows/main.yml

@@ -34,7 +34,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest]
+        os: [ubuntu-22.04, windows-latest]
         cargo_flags:
           - ""
           - "--all-features"