[workflows] Fix GitHub action bugs

1. The Ubuntu version in pre-compile_llvm.yml should have been updated to 22.04.

2. UbuntuDockerfile should install python3-openssl instead of python-openssl.
   The latter no longer exists in 22.04.

Author: bryanpkc

.github/workflows/pre-compile_llvm.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   build:
     name: Ubuntu Linux
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
         target: [X86]