Bump org.liquibase:liquibase-core from 4.27.0 to 4.29.1 in /backend

Bumps [org.liquibase:liquibase-core](https://github.com/liquibase/liquibase) from 4.27.0 to 4.29.1.
- [Release notes](https://github.com/liquibase/liquibase/releases)
- [Changelog](https://github.com/liquibase/liquibase/blob/master/changelog.txt)
- [Commits](liquibase/liquibase@v4.27.0...v4.29.1)

---
updated-dependencies:
- dependency-name: org.liquibase:liquibase-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

backend/build.gradle

@@ -73,7 +73,7 @@ dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
     implementation 'org.springframework.boot:spring-boot-starter-validation'
     implementation 'io.hypersistence:hypersistence-utils-hibernate-62:3.7.6' // this provides additional types for JsonB and for ListArray types in Postgres
-    implementation 'org.liquibase:liquibase-core:4.27.0'
+    implementation 'org.liquibase:liquibase-core:4.29.1'
     implementation 'org.postgresql:postgresql:42.7.3'
 
     // data validation