🚀 Imply List<Map> as JSON content (#1737)

Resolves #1736.

### New Pull Request Checklist

- [x] I have read the
[Documentation](https://pub.dev/documentation/dio/latest/)
- [x] I have searched for a similar pull request in the
[project](https://github.com/cfug/dio/pulls) and found none
- [x] I have updated this branch with the latest `main` branch to avoid
conflicts (via merge from master or rebase)
- [x] I have added the required tests to prove the fix/feature I'm
adding
- [x] I have updated the documentation (if necessary)
- [x] I have run the tests without failures
- [x] I have updated the `CHANGELOG.md` in the corresponding package

dio/CHANGELOG.md

@@ -2,7 +2,7 @@
 
 ## Unreleased
 
-*None.*
+- Imply `List<Map>` as JSON content in `ImplyContentTypeInterceptor`.
 
 ## 5.0.2
 

dio/lib/src/interceptors/imply_content_type.dart

@@ -31,13 +31,13 @@ class ImplyContentTypeInterceptor extends Interceptor {
       final String? contentType;
       if (data is FormData) {
         contentType = Headers.multipartFormDataContentType;
-      } else if (data is Map || data is String) {
+      } else if (data is List<Map> || data is Map || data is String) {
         contentType = Headers.jsonContentType;
       } else {
         // Do not log in the release mode.
         if (!_kReleaseMode) {
           dev.log(
-            '${data.runtimeType} cannot be used'
+            '${data.runtimeType} cannot be used '
             'to imply a default content-type, '
             'please set a proper content-type in the request.',
             level: 900,

dio/test/interceptor_test.dart

@@ -376,6 +376,18 @@ void main() {
         expect(response.requestOptions.contentType, 'application/json');
       });
 
+      test('sets application/json for List<Map> instances', () async {
+        final dio = createDio();
+        final response = await dio.get(
+          '/echo',
+          data: [
+            {'hello': 'here'},
+            {'hello': 'there'}
+          ],
+        );
+        expect(response.requestOptions.contentType, 'application/json');
+      });
+
       test('sets multipart/form-data for FormData instances', () async {
         final dio = createDio();
         final response = await dio.get(