Bump org.flywaydb.flyway from 9.21.1 to 9.21.2

Bumps org.flywaydb.flyway from 9.21.1 to 9.21.2.

---
updated-dependencies:
- dependency-name: org.flywaydb.flyway
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

spitfire-server/database/build.gradle

@@ -7,7 +7,7 @@ buildscript {
 }
 
 plugins {
-    id 'org.flywaydb.flyway' version '9.21.1'
+    id 'org.flywaydb.flyway' version '9.21.2'
 }
 
 flyway {