Update ubuntu version of workflows

.github/workflows/build_docs.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   update_build:
     name: Update API docs and build docs
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
         name: Setup checkout

.github/workflows/tests.yml

@@ -7,7 +7,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version: ["3.8", "3.9", "3.10", "3.11"]