Bump androidx.annotation:annotation from 1.5.0 to 1.6.0 in /epublib

Bumps androidx.annotation:annotation from 1.5.0 to 1.6.0.

---
updated-dependencies:
- dependency-name: androidx.annotation:annotation
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

epublib/build.gradle

@@ -32,5 +32,5 @@ android {
 
 dependencies {
     compileOnly "com.android.tools.build:gradle:$agp_version"
-    implementation "androidx.annotation:annotation:1.5.0"
+    implementation "androidx.annotation:annotation:1.6.0"
 }