build(deps): bump mypy from 1.19.1 to 1.20.0 in /block-kit (#47)

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Author: dependabot[bot]

block-kit/requirements.txt

@@ -1,4 +1,4 @@
-mypy==1.19.1
+mypy==1.20.0
 pytest==9.0.2
 ruff==0.15.8
 slack_sdk==3.41.0