fix(deps): bump com.guardsquare:proguard-base from 7.8.2 to 7.9.1

Bumps [com.guardsquare:proguard-base](https://github.com/Guardsquare/proguard) from 7.8.2 to 7.9.1.
- [Release notes](https://github.com/Guardsquare/proguard/releases)
- [Commits](Guardsquare/proguard@v7.8.2...v7.9.1)

---
updated-dependencies:
- dependency-name: com.guardsquare:proguard-base
  dependency-version: 7.9.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pom.xml

@@ -248,7 +248,7 @@ SPDX-ArtifactOfProjectHomePage: https://github.com/vegardit/copycat
                   <!-- https://github.com/Guardsquare/proguard -->
                   <groupId>com.guardsquare</groupId>
                   <artifactId>proguard-base</artifactId>
-                  <version>7.8.2</version>
+                  <version>7.9.1</version>
                </dependency>
                <dependency>
                   <!-- https://github.com/Guardsquare/proguard-core -->