[.pre-commit-config.yaml]: Fix Black required-version

The black pre-commit hook fails when using the `required-version` option
(either as command line option or in a config file).  This commit uses
the fix proposed in
psf/black#2493 (comment).

.pre-commit-config.yaml

@@ -141,7 +141,10 @@ repos:
           - "colorama"
 
   - repo: "https://github.com/psf/black"
-    rev: "22.3.0"
+    # The `refs/tags/<tag>:refs/tags/<tag>` is needed for black's
+    # `required-version` option to work.  See
+    # https://github.com/psf/black/issues/2493#issuecomment-1081987650
+    rev: "refs/tags/22.3.0:refs/tags/22.3.0"
     hooks:
       # Format Python code with black.
       - id: "black"