Bump net.ttddyy:datasource-proxy from 1.9 to 1.10 in /backend (#7714)

Bumps [net.ttddyy:datasource-proxy](https://github.com/jdbc-observations/datasource-proxy) from 1.9 to 1.10.
- [Release notes](https://github.com/jdbc-observations/datasource-proxy/releases)
- [Changelog](https://github.com/jdbc-observations/datasource-proxy/blob/1.x/CHANGELOG.md)
- [Commits](jdbc-observations/datasource-proxy@datasource-proxy-1.9...datasource-proxy-1.10)

---
updated-dependencies:
- dependency-name: net.ttddyy:datasource-proxy
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

backend/build.gradle

@@ -117,7 +117,7 @@ dependencies {
     // test/check dependencies
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
     testImplementation 'org.springframework.security:spring-security-test'
-    testImplementation 'net.ttddyy:datasource-proxy:1.9'
+    testImplementation 'net.ttddyy:datasource-proxy:1.10'
 
     // used to autoconfigure WireMock for testing
     testImplementation 'org.springframework.cloud:spring-cloud-contract-wiremock'