GHA/windows: give more time for Ubuntu installs

Recently sometimes the Ubuntu package repository is very slow to access.
Remove the time limit for the install step, and bump the total limit,
aligning with Linux jobs.

In most cases the `install packages` steps takes 15-25 seconds.
Sometimes this goes up to 30-45 minutes.

Reported-by: nevakrien on github
Bug: https://github.com/curl/curl/discussions/14854#discussioncomment-13988574
Closes #18163

.github/workflows/windows.yml

@@ -597,7 +597,7 @@ jobs:
   linux-cross-mingw-w64:
     name: "linux-mingw, ${{ matrix.build == 'cmake' && 'CM' || 'AM' }} ${{ matrix.compiler }}"
     runs-on: ubuntu-latest
-    timeout-minutes: 15
+    timeout-minutes: 45
     env:
       MAKEFLAGS: -j 5
       TRIPLET: 'x86_64-w64-mingw32'
@@ -612,7 +612,6 @@ jobs:
           - { build: 'cmake'    , compiler: 'clang-tidy' }
     steps:
       - name: 'install packages'
-        timeout-minutes: 5
         env:
           INSTALL_PACKAGES: ${{ matrix.compiler == 'clang-tidy' && 'clang' || '' }}
         run: |