CI: remove deprecated windows-2019 usage

Author: Paolo Tranquilli

.github/workflows/build-ripunzip.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-22.04, macos-13, windows-2019]
+        os: [ubuntu-24.04, macos-15, windows-2025]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4

.github/workflows/csharp-qltest.yml

@@ -36,7 +36,7 @@ jobs:
   unit-tests:
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-2019]
+        os: [ubuntu-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4