fix: Use / in relative path for Windows

[AlexV525]

Description

As we all know, Windows uses \ as a path separator, so it is reasonable to generate configs that use the same separator for Windows. But for Run Configurations and Pubspec Dependencies, / works on all platforms. Using / will significantly reduce the pain when those configurations are checked out to their code version control.

This is first implemented by 86a87a6.

Diff on Windows

Before:

<component name="ProjectRunConfigurationManager">
  <configuration default="false" name="Flutter Run -&gt; 'app'" type="FlutterRunConfigurationType" factoryName="Flutter">
    <option name="filePath" value="$PROJECT_DIR$/app\lib\main.dart" />
    <method v="2" />
  </configuration>
</component>

dependency_overrides:
  package_a:
    path: ..\\package_a

After:

<component name="ProjectRunConfigurationManager">
  <configuration default="false" name="Flutter Run -&gt; 'app'" type="FlutterRunConfigurationType" factoryName="Flutter">
    <option name="filePath" value="$PROJECT_DIR$/app/lib/main.dart" />
    <method v="2" />
  </configuration>
</component>

dependency_overrides:
  package_a:
    path: ../package_a

Type of Change

• 🛠️ fix -- Bug fix (non-breaking change which fixes an issue)

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