U 20.04 for binary build & release

Build and GitHub release to 20.04

.github/workflows/build.yaml

@@ -26,7 +26,7 @@ jobs:
   build:
 
     name: Build - ${{ matrix.job.name }}
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
@@ -166,7 +166,7 @@ jobs:
     needs: 
       - build
       - build-win
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix: