CI: specify ubuntu_latest for armv7

Author: HuguesDelorme

.github/workflows/ci_linux_ubuntu_armv7.yml

@@ -8,7 +8,7 @@ jobs:
             matrix:
                 include:
                     - arch: armv7
-                      distro: ubuntu22.04
+                      distro: ubuntu_latest
 
         runs-on: ubuntu-latest
 
@@ -23,7 +23,6 @@ jobs:
           uses: uraimo/run-on-arch-action@v2
           with:
               arch: ${{matrix.arch}}
-
               distro: ${{matrix.distro}}
 
               # Not required, but speeds up builds