chore(deps): bump com.vaadin:vaadin-bom from 24.4.18 to 24.4.20 (#1127)

Bumps com.vaadin:vaadin-bom from 24.4.18 to 24.4.20.

---
updated-dependencies:
- dependency-name: com.vaadin:vaadin-bom
  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

@@ -47,7 +47,7 @@
             For backward compatibility of GH actions workflows
             To be removed in the future
         -->
-        <hilla.version>24.4.18</hilla.version>
+        <hilla.version>24.4.20</hilla.version>
         <vaadin.version>${hilla.version}</vaadin.version>
 
         <jackson.version>2.18.2</jackson.version>