chore(deps): pin dependencies

[renovate]

This PR contains the following updates:

Package	Update	Change
alpine	pinDigest	→ 28bd5fe
calcom/cal.com	pinDigest	→ ace3bb1
docker.io/eqalpha/keydb	pinDigest	→ 3ba477d
docker.io/library/postgres	pinDigest	→ 57c72fd
ghcr.io/imputnet/cobalt	pinDigest	→ 63186dd
ghcr.io/linagora/tmail-web	pinDigest	→ 83c31fe
ghcr.io/open-webui/open-webui	pinDigest	→ 9fcea9c
ghcr.io/thundersquared/1min-relay	pinDigest	→ 37e09c2
ghcr.io/thundersquared/stalwart	pinDigest	→ a930aca
headscale/headscale	pinDigest	→ d337f1b
mariadb	pinDigest	→ 628f228
mysql	pinDigest	→ c592c15
opensearchproject/opensearch	pinDigest	→ 44ba7ea
postgres	pinDigest	→ 996d092
postgres	pinDigest	→ 9a8afca
roundcube/roundcubemail	pinDigest	→ 89083b9
valkey/valkey	pinDigest	→ c9b7791

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