[path_provider]: Bump gradle from 3.3.0 to 7.3.1 in /packages/path_provider/path_provider_android/android (#6578)

diff --git a/packages/path_provider/path_provider_android/CHANGELOG.md b/packages/path_provider/path_provider_android/CHANGELOG.md
index c36a771..ebd6568 100644
--- a/packages/path_provider/path_provider_android/CHANGELOG.md
+++ b/packages/path_provider/path_provider_android/CHANGELOG.md
@@ -1,7 +1,9 @@
-## NEXT
+## 2.0.21
 
 * Updates code for `no_leading_underscores_for_local_identifiers` lint.
 * Updates minimum Flutter version to 2.10.
+* Upgrades `androidx.annotation` version to 1.5.0.
+* Upgrades Android Gradle plugin version to 7.3.1.
 
 ## 2.0.20
 
diff --git a/packages/path_provider/path_provider_android/android/build.gradle b/packages/path_provider/path_provider_android/android/build.gradle
index 32c046b..9661390 100644
--- a/packages/path_provider/path_provider_android/android/build.gradle
+++ b/packages/path_provider/path_provider_android/android/build.gradle
@@ -8,7 +8,7 @@
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.3.0'
+        classpath 'com.android.tools.build:gradle:7.3.1'
     }
 }
 
@@ -54,7 +54,7 @@
 }
 
 dependencies {
-    implementation 'androidx.annotation:annotation:1.1.0'
+    implementation 'androidx.annotation:annotation:1.5.0'
     implementation 'com.google.guava:guava:28.1-android'
     testImplementation 'junit:junit:4.13.2'
 }
diff --git a/packages/path_provider/path_provider_android/pubspec.yaml b/packages/path_provider/path_provider_android/pubspec.yaml
index fba4c32..5d1e6c7 100644
--- a/packages/path_provider/path_provider_android/pubspec.yaml
+++ b/packages/path_provider/path_provider_android/pubspec.yaml
@@ -2,7 +2,7 @@
 description: Android implementation of the path_provider plugin.
 repository: https://github.com/flutter/plugins/tree/main/packages/path_provider/path_provider_android
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+path_provider%22
-version: 2.0.20
+version: 2.0.21
 
 environment:
   sdk: ">=2.14.0 <3.0.0"