Bump icu4j-charset from 70.1 to 71.1 (#8805)

Bumps [icu4j-charset](https://github.com/unicode-org/icu) from 70.1 to 71.1.
- [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-charset
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

build.gradle

@@ -123,7 +123,7 @@ dependencies {
     implementation 'com.h2database:h2-mvstore:2.1.212'
 
     implementation group: 'org.apache.tika', name: 'tika-core', version: '2.4.0'
-    implementation 'com.ibm.icu:icu4j-charset:70.1'
+    implementation 'com.ibm.icu:icu4j-charset:71.1'
 
     // required for reading write-protected PDFs - see https://github.com/JabRef/jabref/pull/942#issuecomment-209252635
     implementation 'org.bouncycastle:bcprov-jdk15on:1.70'