.github: cross-build binaries on ubuntu-latest.

Use ubuntu-latest instead of deprecated ubuntu-20.04 for binary
cross-build sanity checks.

Signed-off-by: Krisztian Litkey <[email protected]>

Author: klihub

.github/workflows/sanity.yml

@@ -49,7 +49,7 @@ jobs:
   # Make sure binaries compile on multiple platforms.
   crossbuild:
     name: "Build / Crossbuild Binaries"
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix: