build: update `REQUIRED_BASE_SHA` in merge script to clang 1.4.0 upgrade commit (#36547)
build: update `REQUIRED_BASE_SHA` in merge script to clang 1.4.0 upgrade commit (#36547)

Updating `REQUIRED_BASE_SHA` for master and patch branches to make sure PRs that we merge are rebased after clang 1.4.0 upgrade.

PR Close #36547

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