Change Ubuntu build target version.

Modified the build workflow to use Ubuntu-20.04 rather than Ubuntu-Latest, hopefully this will provide better compatibility with a wider range of Linux distros!

Author: ItsThatOneJack-Dev

.github/workflows/build-release.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ${{matrix.os}}
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest]
+        os: [ubuntu-20.04, windows-latest]
 
     steps:
       - name: Checkout code