chore(deps): update ksp to v1.9.21-1.0.16

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.devtools.ksp (source)	1.9.21-1.0.15 -> 1.9.21-1.0.16
com.google.devtools.ksp:com.google.devtools.ksp.gradle.plugin (source)	1.9.21-1.0.15 -> 1.9.21-1.0.16

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Release Notes

google/ksp (com.google.devtools.ksp)

v1.9.21-1.0.16

Compare Source

Issue fixed

#​1653 KSP 1.9.21-1.0.15 leaking memory and causing OOMs

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[what-the-diff]

PR Summary

• Upgrade of the ksp version
  The ksp version used in our project has been updated. With this update, we are moving from version 1.9.21-1.0.15 to 1.9.21-1.0.16 in our gradle/libs.versions.toml file. This should provide us with any enhancements, bug fixes or performance improvements that come with the new version.