[connectivity] Migrate maven repo from jcenter to mavenCentral (#3909)

diff --git a/packages/connectivity/connectivity/CHANGELOG.md b/packages/connectivity/connectivity/CHANGELOG.md
index 3d69b7b..b719a01 100644
--- a/packages/connectivity/connectivity/CHANGELOG.md
+++ b/packages/connectivity/connectivity/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 3.0.4
+
+* Migrate maven repository from jcenter to mavenCentral.
+
 ## 3.0.3
 
 * Re-endorse connectivity_for_web
diff --git a/packages/connectivity/connectivity/android/build.gradle b/packages/connectivity/connectivity/android/build.gradle
index 30ab478..afd7d9f 100644
--- a/packages/connectivity/connectivity/android/build.gradle
+++ b/packages/connectivity/connectivity/android/build.gradle
@@ -5,7 +5,7 @@
 buildscript {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 
     dependencies {
@@ -16,7 +16,7 @@
 rootProject.allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }
 
diff --git a/packages/connectivity/connectivity/example/android/build.gradle b/packages/connectivity/connectivity/example/android/build.gradle
index e0d7ae2..456d020 100644
--- a/packages/connectivity/connectivity/example/android/build.gradle
+++ b/packages/connectivity/connectivity/example/android/build.gradle
@@ -1,7 +1,7 @@
 buildscript {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 
     dependencies {
@@ -12,7 +12,7 @@
 allprojects {
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
 }
 
diff --git a/packages/connectivity/connectivity/pubspec.yaml b/packages/connectivity/connectivity/pubspec.yaml
index 34a8706..dc26ac5 100644
--- a/packages/connectivity/connectivity/pubspec.yaml
+++ b/packages/connectivity/connectivity/pubspec.yaml
@@ -2,7 +2,7 @@
 description: Flutter plugin for discovering the state of the network (WiFi &
   mobile/cellular) connectivity on Android and iOS.
 homepage: https://github.com/flutter/plugins/tree/master/packages/connectivity/connectivity
-version: 3.0.3
+version: 3.0.4
 
 flutter:
   plugin: