chore(deps): bump annotation from 1.3.0 to 1.4.0 in /epublib

Bumps annotation from 1.3.0 to 1.4.0.

---
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

@@ -33,5 +33,5 @@ android {
 }
 
 dependencies {
-    implementation "androidx.annotation:annotation:1.3.0"
+    implementation "androidx.annotation:annotation:1.4.0"
 }