fix: update workflow to use ubuntu-latest for consistency

Author: JakubAndrysek

.github/workflows/build-test.yml

@@ -4,7 +4,7 @@ on: [push]
 
 jobs:
   build-test:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:

.github/workflows/deploy-docs.yml

@@ -4,7 +4,7 @@ on:
     branches: [ master ]
 jobs:
   deploy:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
         with: