chore(deps): bump org.apache.avro:avro in /spanner/changestreams (#9560)

Bumps org.apache.avro:avro from 1.11.3 to 1.11.4.

---
updated-dependencies:
- dependency-name: org.apache.avro:avro
  dependency-type: direct:production
...

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

Author: dependabot[bot]