Bump the development-dependencies group with 2 updates (#9639)

Bumps the development-dependencies group with 2 updates: org.hsqldb:hsqldb and [com.thoughtworks.xstream:xstream](https://github.com/x-stream/xstream).


Updates `org.hsqldb:hsqldb` from 2.7.3 to 2.7.4

Updates `com.thoughtworks.xstream:xstream` from 1.4.20 to 1.4.21
- [Release notes](https://github.com/x-stream/xstream/releases)
- [Commits](https://github.com/x-stream/xstream/commits)

---
updated-dependencies:
- dependency-name: org.hsqldb:hsqldb
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: development-dependencies
- dependency-name: com.thoughtworks.xstream:xstream
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: development-dependencies
...

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

build.gradle

@@ -74,7 +74,7 @@ ext {
     hamcrestVersion = '2.2'
     hazelcastVersion = '5.3.8'
     hibernateVersion = '6.4.10.Final'
-    hsqldbVersion = '2.7.3'
+    hsqldbVersion = '2.7.4'
     h2Version = '2.2.224'
     jacksonVersion = '2.15.4'
     jaxbVersion = '4.0.5'
@@ -119,7 +119,7 @@ ext {
     testcontainersVersion = '1.19.8'
     tomcatVersion = '10.1.31'
     xmlUnitVersion = '2.9.1'
-    xstreamVersion = '1.4.20'
+    xstreamVersion = '1.4.21'
     ztZipVersion = '1.16'
 
     javaProjects = subprojects - project(':spring-integration-bom')