Bump com.fasterxml.jackson:jackson-bom from 2.18.5 to 2.18.6

Bumps [com.fasterxml.jackson:jackson-bom](https://github.com/FasterXML/jackson-bom) from 2.18.5 to 2.18.6.
- [Commits](https://github.com/FasterXML/jackson-bom/compare/jackson-bom-2.18.5...jackson-bom-2.18.6)

---
updated-dependencies:
- dependency-name: com.fasterxml.jackson:jackson-bom
  dependency-version: 2.18.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 org-springframework = "6.2.16"
 org-springframework-security = "6.5.8"
-com-fasterxml-jackson = "2.18.5"
+com-fasterxml-jackson = "2.18.6"
 nimbus-jose-jwt = "9.47"
 org-bouncycastle = "1.79"
 com-squareup-okhttp3 = "4.12.0"