Bump org.axonframework:axon-bom from 4.7.3 to 4.8.1

Bumps [org.axonframework:axon-bom](https://github.com/AxonFramework/axon-bom) from 4.7.3 to 4.8.1.
- [Release notes](https://github.com/AxonFramework/axon-bom/releases)
- [Commits](AxonFramework/axon-bom@axon-4.7.3...axon-4.8.1)

---
updated-dependencies:
- dependency-name: org.axonframework:axon-bom
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -16,7 +16,7 @@
 
  <properties>
  <java.version>17</java.version>
- <axon.version>4.7.3</axon.version>
+ <axon.version>4.8.1</axon.version>
  <testcontainers.version>1.18.1</testcontainers.version>
  <skipIntegrationTests>true</skipIntegrationTests>
  <git.repository>fraktalio/courier-demo</git.repository>