[webview]: Bump androidx.webkit:webkit

Bumps androidx.webkit:webkit from 1.5.0 to 1.6.0.

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

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

packages/webview_flutter/webview_flutter_android/android/build.gradle

@@ -35,7 +35,7 @@ android {
 
     dependencies {
         implementation 'androidx.annotation:annotation:1.5.0'
-        implementation 'androidx.webkit:webkit:1.5.0'
+        implementation 'androidx.webkit:webkit:1.6.0'
         testImplementation 'junit:junit:4.13.2'
         testImplementation 'org.mockito:mockito-inline:5.1.0'
         testImplementation 'androidx.test:core:1.3.0'