Bump lints from 3.0.0 to 6.0.0 (#433)

* Bump lints from 3.0.0 to 6.0.0

Bumps [lints](https://github.com/dart-lang/core/tree/main/pkgs) from 3.0.0 to 6.0.0.
- [Release notes](https://github.com/dart-lang/core/releases)
- [Commits](https://github.com/dart-lang/core/commits/lints-v6.0.0/pkgs)

---
updated-dependencies:
- dependency-name: lints
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

* Fix lint

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: curquiza <clementine@meilisearch.com>

Author: dependabot[bot]

lib/meilisearch.dart

@@ -1,5 +1,3 @@
-library meilisearch;
-
 export 'src/settings/_exports.dart';
 export 'src/results/_exports.dart';
 export 'src/query_parameters/_exports.dart';

lib/src/tenant_token.dart

@@ -1,5 +1,3 @@
-library tenant_token;
-
 import 'dart:convert';
 import 'dart:typed_data';
 import 'package:crypto/crypto.dart';

pubspec.yaml

@@ -18,7 +18,7 @@ dependencies:
 dev_dependencies:
   test: ^1.0.0
   dart_jsonwebtoken: ">=2.12.2 <4.0.0"
-  lints: ">=2.1.0 <4.0.0"
+  lints: ">=2.1.0 <7.0.0"
   json_serializable: ^6.7.1
   build_runner: ^2.4.6
   pub_semver: ^2.1.5

test/analytics_test.dart

@@ -1,4 +1,5 @@
 @TestOn('vm')
+library;
 
 import 'dart:io';