Bump com.guardsquare:proguard-base from 7.5.0 to 7.6.0

Bumps [com.guardsquare:proguard-base](https://github.com/Guardsquare/proguard) from 7.5.0 to 7.6.0.
- [Release notes](https://github.com/Guardsquare/proguard/releases)
- [Commits](Guardsquare/proguard@v7.5...v7.6)

---
updated-dependencies:
- dependency-name: com.guardsquare:proguard-base
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -138,7 +138,7 @@
         <picocli.version>4.7.6</picocli.version>
         <poi.ooxml.version>5.3.0</poi.ooxml.version>
         <proguard.core.version>9.1.6</proguard.core.version>
-        <proguard.version>7.5.0</proguard.version>
+        <proguard.version>7.6.0</proguard.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <prosys.sdk.version>5.2.6-151</prosys.sdk.version>
         <protobuf.version>4.28.2</protobuf.version>