Ignore dependabot minor and patch updates of Kotlin mocking library (flutter#8056)

The dependabot version bumps are set up to ignore minor and patch "testing" dependencies bumps.  Add Kotlin mocking library [io.mockk:mockk:](https://mockk.io/) to that list.  Example where the patch was bumped flutter/packages#7866

This isn't particularly a noisy dependency, but I noticed it when working on flutter/packages#8048.

Also delete `/packages/image_picker/image_picker/android` since that path doesn't exist.

Author: jmagman

.github/dependabot.yml

@@ -87,7 +87,6 @@ updates:
       - /packages/google_sign_in/google_sign_in_android/android
       - /packages/in_app_purchase/in_app_purchase_android/android
       - /packages/interactive_media_ads/android
-      - /packages/image_picker/image_picker/android
       - /packages/image_picker/image_picker_android/android
       - /packages/local_auth/local_auth_android/android
       - /packages/path_provider/path_provider_android/android
@@ -114,4 +113,5 @@ updates:
         update-types: ["version-update:semver-minor", "version-update:semver-patch"]
       - dependency-name: "org.robolectric:*"
         update-types: ["version-update:semver-minor", "version-update:semver-patch"]
-
+      - dependency-name: "io.mockk:mockk:*"
+        update-types: ["version-update:semver-minor", "version-update:semver-patch"]