[WIP] ci: upgrade windows-2022 to windows-2025.

Author: eddyb

.github/workflows/ci.yaml

@@ -17,7 +17,7 @@ jobs:
     name: Test
     strategy:
       matrix:
-        os: [ ubuntu-24.04, windows-2022, macOS-latest ]
+        os: [ ubuntu-24.04, windows-2025, macOS-latest ]
     runs-on: ${{ matrix.os }}
     env:
       RUSTUP_UNPACK_RAM: "26214400"
@@ -120,7 +120,7 @@ jobs:
     name: Compiletest
     strategy:
       matrix:
-        os: [ ubuntu-24.04, windows-2022, macOS-latest ]
+        os: [ ubuntu-24.04, windows-2025, macOS-latest ]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
@@ -140,7 +140,7 @@ jobs:
     name: Difftest
     strategy:
       matrix:
-        os: [ ubuntu-24.04, windows-2022, macOS-latest ]
+        os: [ ubuntu-24.04, windows-2025, macOS-latest ]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4