Bump com.guardsquare:proguard-base from 7.6.1 to 7.7.0

Bumps [com.guardsquare:proguard-base](https://github.com/Guardsquare/proguard) from 7.6.1 to 7.7.0.
- [Release notes](https://github.com/Guardsquare/proguard/releases)
- [Commits](Guardsquare/proguard@v7.6.1...v7.7)

---
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]>

Author: dependabot[bot]

pom.xml

@@ -8,7 +8,7 @@
 		<cctimestamp>NO_TIMESTAMP</cctimestamp>
 		<scm.revision>NO_SCM_REVISION</scm.revision>
 
-		<version.proguard>7.6.1</version.proguard>
+		<version.proguard>7.7.0</version.proguard>
 		<version.proguard-core>9.1.9</version.proguard-core>
 	</properties>