Lint: Implement check for spaces, not tabs per PEP 12 (#2379)

.pre-commit-config.yaml

@@ -70,6 +70,12 @@ repos:
   # Local checks for PEP headers and more
   - repo: local
     hooks:
+      - id: check-no-tabs
+        name: "Check tabs not used in PEPs"
+        language: pygrep
+        entry: '\t'
+        files: '^pep-\d+\.(rst|txt)$'
+        types: [text]
       - id: check-required-fields
         name: "Check PEPs have all required fields"
         language: pygrep