GHA/windows: do apt-get update in clang-tidy cross-build job again

Syncing with most similar uses in other workflows.

Fixing, e.g.:
```
E: Failed to fetch http://azure.archive.ubuntu.com/ubuntu/pool/universe/l/
  llvm-toolchain-20/llvm-20-linker-tools_20.1.2-0ubuntu1%7e24.04.2_amd64.deb
  404  Not Found [IP: 172.66.152.176 443]
```
Ref: https://github.com/curl/curl/actions/runs/27682974841/job/81877061033?pr=22061

Follow-up to 1b8449674a #14992

Closes #22064

.github/workflows/windows.yml

@@ -789,6 +789,7 @@ jobs:
           MATRIX_INSTALL_PACKAGES: '${{ matrix.install_packages }}'
         run: |
           sudo sed -i 's/priority:1/priority:9/' /etc/apt/apt-mirrors.txt; cat /etc/apt/apt-mirrors.txt
+          sudo apt-get -o Dpkg::Use-Pty=0 update
           sudo apt-get -o Dpkg::Use-Pty=0 install gcc-mingw-w64-x86-64-win32 ${MATRIX_INSTALL_PACKAGES}
 
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2