Replace occurences of ubuntu-20 by ubuntu-22 in .github/workflows

Author: oscarsj

.github/workflows/build-ripunzip.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, macos-13, windows-2019]
+        os: [ubuntu-22.04, macos-13, windows-2019]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4