Bump com.google.devtools.ksp:symbol-processing-api

Bumps [com.google.devtools.ksp:symbol-processing-api](https://github.com/google/ksp) from 2.1.20-2.0.1 to 2.1.21-2.0.1.
- [Release notes](https://github.com/google/ksp/releases)
- [Commits](google/ksp@2.1.20-2.0.1...2.1.21-2.0.1)

---
updated-dependencies:
- dependency-name: com.google.devtools.ksp:symbol-processing-api
  dependency-version: 2.1.21-2.0.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -144,7 +144,7 @@
     <morphia.version>2.5.0</morphia.version>
     <jmh.version>1.37</jmh.version>
     <kotlin.version>2.1.21</kotlin.version>
-    <ksp.version>2.1.20-2.0.1</ksp.version>
+    <ksp.version>2.1.21-2.0.1</ksp.version>
     <kotlinpoet.version>2.1.0</kotlinpoet.version>
     <dokka.version>2.0.0</dokka.version>
     <scala.version>2.11.12</scala.version>