[path_provider]: Bump junit

Bumps [junit](https://github.com/junit-team/junit4) from 4.12 to 4.13.2.
- [Release notes](https://github.com/junit-team/junit4/releases)
- [Changelog](https://github.com/junit-team/junit4/blob/main/doc/ReleaseNotes4.12.md)
- [Commits](junit-team/junit4@r4.12...r4.13.2)

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

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

packages/path_provider/path_provider_android/android/build.gradle

@@ -54,5 +54,5 @@ android {
 dependencies {
     implementation 'androidx.annotation:annotation:1.1.0'
     implementation 'com.google.guava:guava:28.1-android'
-    testImplementation 'junit:junit:4.12'
+    testImplementation 'junit:junit:4.13.2'
 }