Bump com.ibm.icu:icu4j from 60.3 to 75.1

Bumps [com.ibm.icu:icu4j](https://github.com/unicode-org/icu) from 60.3 to 75.1.
- [Release notes](https://github.com/unicode-org/icu/releases)
- [Commits](https://github.com/unicode-org/icu/commits)

---
updated-dependencies:
- dependency-name: com.ibm.icu:icu4j
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

build.gradle

@@ -49,7 +49,7 @@ dependencies {
     testCompile "org.springframework:spring-test:5.2.7.RELEASE"
     testCompile "org.springframework:spring-web:5.2.7.RELEASE"
     testCompile group: 'org.hamcrest', name: 'hamcrest', version: '2.1'
-    testCompile group: 'com.ibm.icu', name: 'icu4j', version: '60.3'
+    testCompile group: 'com.ibm.icu', name: 'icu4j', version: '75.1'
 }
 sourceSets {
   main {