Update dependency axllent/mailpit to v1.21.1 · druidfi/stonehenge@8b6c3ac

These files were overwritten during the `brew link` step:

Skipping aws-sam-cli: most recent version 1.127.0 not installed

Skipping gcc: most recent version 14.2.0_1 not installed

Skipping gh: most recent version 2.60.1 not installed

Skipping swiftformat: most recent version 0.54.6_1 not installed

Skipping swiftlint: most recent version 0.57.0_1 not installed

Skipping unxip: most recent version 3.1 not installed

Skipping xcbeautify: most recent version 2.14.1_1 not installed

Skipping xcodes: most recent version 1.6.0 not installed

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