build(deps): bump mypy from 2.3.0 to 2.3.1 in /block-kit (#195)

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Author: dependabot[bot]

block-kit/requirements.txt

@@ -1,4 +1,4 @@
-mypy==2.3.0
+mypy==2.3.1
 pytest==9.1.1
 ruff==0.16.3
 slack_sdk==3.43.0