Add more jsonschema pre-commit hooks (#625)

Author: AlexWaygood

.github/workflows/third_party.yml

@@ -35,7 +35,7 @@ jobs:
       github.repository == 'python/typing_extensions'
       || github.event_name != 'schedule'
     steps:
-      - run: true
+      - run: "true"
 
   pydantic:
     name: pydantic tests

.pre-commit-config.yaml

@@ -21,6 +21,8 @@ repos:
     rev: 0.33.0
     hooks:
       - id: check-dependabot
+      - id: check-github-workflows
+      - id: check-readthedocs
   - repo: https://github.com/abravalheri/validate-pyproject
     rev: v0.24.1
     hooks: