build(deps): bump apicurio-registry.version in /api (#1433)

Bumps `apicurio-registry.version` from 2.6.7.Final to 2.6.8.Final.

Updates `io.apicurio:apicurio-registry-serdes-avro-serde` from 2.6.7.Final to 2.6.8.Final

Updates `io.apicurio:apicurio-registry-serdes-protobuf-serde` from 2.6.7.Final to 2.6.8.Final

Updates `io.apicurio:apicurio-registry-client` from 2.6.7.Final to 2.6.8.Final

---
updated-dependencies:
- dependency-name: io.apicurio:apicurio-registry-serdes-avro-serde
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: io.apicurio:apicurio-registry-serdes-protobuf-serde
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: io.apicurio:apicurio-registry-client
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pom.xml

@@ -19,7 +19,7 @@
         <quarkus.platform.version>3.15.3</quarkus.platform.version>
         <strimzi-api.version>0.45.0</strimzi-api.version>
         <strimzi-oauth.version>0.15.0</strimzi-oauth.version>
-        <apicurio-registry.version>2.6.7.Final</apicurio-registry.version>
+        <apicurio-registry.version>2.6.8.Final</apicurio-registry.version>
 
         <!-- Test Dependencies -->
         <hamcrest.version>3.0</hamcrest.version>