Bump com.ibm.icu:icu4j from 78.2 to 78.3

Bumps [com.ibm.icu:icu4j](https://github.com/unicode-org/icu) from 78.2 to 78.3.
- [Release notes](https://github.com/unicode-org/icu/releases)
- [Commits](unicode-org/icu@release-78.2...release-78.3)

---
updated-dependencies:
- dependency-name: com.ibm.icu:icu4j
  dependency-version: '78.3'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

openpdf-core/pom.xml

@@ -21,7 +21,7 @@
     <dependency>
       <groupId>com.ibm.icu</groupId>
       <artifactId>icu4j</artifactId>
-      <version>78.2</version>
+      <version>78.3</version>
       <optional>true</optional>
     </dependency>
     <dependency>