Merge remote-tracking branch 'upstream/master' into feat/hcl

* upstream/master:
  github: bump linux version to latest

Author: rchl

.github/workflows/ci.yaml

@@ -12,7 +12,7 @@ on:
 jobs:
   build:
     name: Run syntax_tests (${{ matrix.st.name }})
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         st: