Bump org.apache.avro:avro from 1.11.3 to 1.12.0

Bumps org.apache.avro:avro from 1.11.3 to 1.12.0.

---
updated-dependencies:
- dependency-name: org.apache.avro:avro
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

bom/build.gradle

@@ -23,7 +23,7 @@ ext {
     // TODO: version 4 under new package name
     antlrVersion = '3.5.3'
     ST4Version = '4.3.4'
-    avroVersion = '1.11.3'
+    avroVersion = '1.12.0'
     xtdbVersion = '1.24.4'
     clojureVersion = '1.11.1'
     classgraphVersion = '4.8.172'