[local_auth]: Bump espresso-core (flutter#6925)

Bumps espresso-core from 3.2.0 to 3.5.1.

---
updated-dependencies:
- dependency-name: androidx.test.espresso:espresso-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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packages/local_auth/local_auth_android/android/build.gradle

@@ -59,5 +59,5 @@ dependencies {
     testImplementation 'org.robolectric:robolectric:4.5'
     androidTestImplementation 'androidx.test:runner:1.2.0'
     androidTestImplementation 'androidx.test:rules:1.2.0'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
 }