[web_benchmarks] Bump process version constraints (#5122)

Prep for flutter/flutter#136418.

Author: goderbauer

packages/web_benchmarks/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.1.0+7
+
+* Updates `package:process` version constraints.
+
 ## 0.1.0+6
 
 * Adds pub topics to package metadata.

packages/web_benchmarks/pubspec.yaml

@@ -2,7 +2,7 @@ name: web_benchmarks
 description: A benchmark harness for performance-testing Flutter apps in Chrome.
 repository: https://github.com/flutter/packages/tree/main/packages/web_benchmarks
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+web_benchmarks%22
-version: 0.1.0+6
+version: 0.1.0+7
 
 environment:
   sdk: ">=2.19.0 <4.0.0"
@@ -16,7 +16,7 @@ dependencies:
   logging: ^1.0.2
   meta: ^1.7.0
   path: ^1.8.0
-  process: ^4.2.4
+  process: ">=4.2.4 <6.0.0"
   shelf: ^1.2.0
   shelf_static: ^1.1.0
   test: ^1.19.5