Update ci to use ubuntu 22.04

- Ubuntu 20.04 runner is deprecated actions/runner-images#11101

Signed-off-by: Keshav Priyadarshi <[email protected]>

Author: keshav-space

Diff for: .github/workflows/docs.yml

@@ -4,7 +4,7 @@ on: [push, pull_request]
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     strategy:
       max-parallel: 4

Diff for: .github/workflows/main.yml

@@ -9,7 +9,7 @@ env:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     services:
       postgres:

Diff for: .github/workflows/pypi-release.yml

@@ -21,7 +21,7 @@ on:
 jobs:
   build-pypi-distribs:
     name: Build and publish library to PyPI
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
       - uses: actions/checkout@master