build(deps): Bump com.google.dagger:dagger-compiler in /backend (#519)

Bumps [com.google.dagger:dagger-compiler](https://github.com/google/dagger) from 2.55 to 2.56.
- [Release notes](https://github.com/google/dagger/releases)
- [Changelog](https://github.com/google/dagger/blob/master/CHANGELOG.md)
- [Commits](google/dagger@dagger-2.55...dagger-2.56)

---
updated-dependencies:
- dependency-name: com.google.dagger:dagger-compiler
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

backend/build.gradle

@@ -59,7 +59,7 @@ dependencies {
 
 	// https://mvnrepository.com/artifact/com.google.dagger/dagger
 	implementation 'com.google.dagger:dagger:2.55'
-	annotationProcessor 'com.google.dagger:dagger-compiler:2.55'
+	annotationProcessor 'com.google.dagger:dagger-compiler:2.56'
 
 	// --------------- Fulib Libraries ---------------