udpate analyzer to allow the latest package_config version

Change-Id: Ib73a378a30ab297ecc45218a57cfedfa62c75f8b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/510120
Reviewed-by: Nate Bosch <nbosch@google.com>
Auto-Submit: Jake Macdonald <jakemac@google.com>

pkg/analyzer/CHANGELOG.md

@@ -1,6 +1,7 @@
 ## 13.2.0-dev
 
 * Internal changes only.
+* Allow package_config `3.x.x`.
 
 ## 13.1.0
 

pkg/analyzer/pubspec.yaml

@@ -18,7 +18,7 @@ dependencies:
   crypto: ^3.0.0
   glob: ^2.0.0
   meta: ^1.18.3
-  package_config: ^2.0.0
+  package_config: '>=2.0.0 <4.0.0'
   path: ^1.9.0
   pub_semver: ^2.1.4
   source_span: ^1.8.0
@@ -44,4 +44,3 @@ dev_dependencies:
   test: any
   test_reflective_loader: any
   vm_service: any
-