[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/BlankSpruce/gersemi: 0.20.1 → 0.21.0](BlankSpruce/gersemi@0.20.1...0.21.0)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -27,7 +27,7 @@ repos:
                 doc/doxygen-awesome.*
             )$
   - repo: https://github.com/BlankSpruce/gersemi
-    rev: 0.20.1
+    rev: 0.21.0
     hooks:
       - id: gersemi
         args: ["--print-config=verbose"]