GHA: skip updating man-db for faster installs (Ubuntu)

This step could take from 5 seconds to 5 minutes, sometimes making it
run out of its time slot. It affected 60 CI jobs.

Saving an estimated minimum of 5 minutes per CI run.

Also fixing:
```
Fri, 25 Apr 2025 06:19:14 GMT
Processing triggers for man-db (2.12.0-4build2) ...
Fri, 25 Apr 2025 06:23:40 GMT
Running kernel seems to be up-to-date.
[...]
Error: The action 'install packages' has timed out after 5 minutes.
```
Ref: https://github.com/curl/curl/actions/runs/14658212268/job/41136971525?pr=17180#step:2:169

Closes #17181

.github/workflows/non-native.yml

@@ -439,6 +439,7 @@ jobs:
         run: |
           sudo rm -f /etc/apt/sources.list.d/microsoft-prod.list
           sudo apt-get -o Dpkg::Use-Pty=0 update
+          sudo rm -f /var/lib/man-db/auto-update
           sudo apt-get -o Dpkg::Use-Pty=0 install nasm
 
       - name: 'vcpkg build'
@@ -626,7 +627,9 @@ jobs:
       fail-fast: false
     steps:
       - name: 'install packages'
-        run: sudo apt-get -o Dpkg::Use-Pty=0 install libfl2
+        run: |
+          sudo rm -f /var/lib/man-db/auto-update
+          sudo apt-get -o Dpkg::Use-Pty=0 install libfl2
 
       - name: 'cache compiler (djgpp)'
         uses: actions/cache@d4323d4df104b026a6aa633fdb11d772146be0bf # v4