chore(main): release auth 0.16.0

[release-please[bot]]

:robot: I have created a release beep boop

0.16.0 (2025-04-11)

Features

• auth/credentials: Return X.509 certificate chain as subject token (#11948) (d445a3f), refs #11757
• auth: Configure DirectPath bound credentials from AllowedHardBoundTokens (#11665) (0fc40bc)

Bug Fixes

• auth: Allow non-default SA credentials for DP (#11828) (3a996b4)
• auth: Restore calling DialContext (#11930) (9ec9a29), refs #11118

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[quartzmo]

do not merge can be lifted after the current release freeze for Next.

[release-please[bot]]

🤖 Created releases:

• auth/v0.16.0

:sunflower: