Bump flake8 version

"pre-commit autoupdate" pointed out that a newer version of flake8 has
been released.  This patch applies the update.  No code changes were
needed.

Approved-By: Simon Marchi <simon.marchi@efficios.com>

.pre-commit-config.yaml

@@ -47,7 +47,7 @@ repos:
         types_or: [file]
         files: 'gdb/.*\.py(\.in)?$'
   - repo:  https://github.com/pycqa/flake8
-    rev: 7.2.0
+    rev: 7.3.0
     hooks:
     - id: flake8
       types_or: [file]