chore: Relax flutter pinned deps (#824)

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## Description

Relaxes the file and platform dependencies so that they don't conflict
with Flutter.

## Type of Change

<!--- Put an `x` in all the boxes that apply: -->

- [ ] ✨ `feat` -- New feature (non-breaking change which adds
functionality)
- [ ] 🛠️ `fix` -- Bug fix (non-breaking change which fixes an issue)
- [ ] ❌ `!` -- Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] 🧹 `refactor` -- Code refactor
- [ ] ✅ `ci` -- Build configuration change
- [ ] 📝 `docs` -- Documentation
- [x] 🗑️ `chore` -- Chore

Author: spydon

melos.yaml

@@ -19,14 +19,14 @@ command:
       cli_util: ^0.4.2
       collection: any
       conventional_commit: ^0.6.0+1
-      file: ^7.0.1
+      file: ^7.0.0
       glob: ^2.1.2
       graphs: ^2.3.2
       http: ^1.2.2
       meta: any
       mustache_template: ^2.0.0
       path: any
-      platform: ^3.1.6
+      platform: ^3.1.5
       pool: ^1.5.1
       prompts: ^2.0.0
       pub_semver: ^2.1.5

packages/melos/pubspec.yaml

@@ -30,15 +30,15 @@ dependencies:
   cli_util: ^0.4.2
   collection: any
   conventional_commit: ^0.6.0+1
-  file: ^7.0.1
+  file: ^7.0.0
   glob: ^2.1.2
   graphs: ^2.3.2
   http: ^1.2.2
   intl: any
   meta: any
   mustache_template: ^2.0.0
   path: any
-  platform: ^3.1.6
+  platform: ^3.1.5
   pool: ^1.5.1
   prompts: ^2.0.0
   pub_semver: ^2.1.5