chore: switch all references of graycore/github-actions-magento2 to mage-os/github-actions

cache-magento/README.md

@@ -9,7 +9,7 @@ See the [action.yml](./action.yml)
 
 | Input              | Description                                                                            | Required | Default      |
 | ------------------ | -------------------------------------------------------------------------------------- | -------- | ------------ |
-| composer_cache_key | A key to version the composer cache. Can be incremented if you need to bust the cache. | false    | '__graycore' |
+| composer_cache_key | A key to version the composer cache. Can be incremented if you need to bust the cache. | false    | '__mageos' |
 | mode               | "The mode for setup, one of: `extension` or `store`."                                  | true     | N/A          |
 | magento_directory  | The Magento directory for the action to run against.                                   | true     | N/A          |
 
@@ -31,7 +31,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
-    - uses: graycoreio/github-actions-magento2/cache-magento@main
+    - uses: mage-os/github-actions/cache-magento@main
       with:
         magento_directory: $GITHUB_WORKSPACE 
         mode: 'store'
@@ -40,4 +40,4 @@ jobs:
     - run: composer install
       shell: bash
       name: Composer install
-```
+```

cache-magento/action.yml

@@ -5,7 +5,7 @@ description: "A Github Action that creates a composer cache for a Magento extens
 inputs:
   composer_cache_key:
     required: false
-    default: "__graycore"
+    default: "__mageos"
     description: A key to version the composer cache. Can be incremented if you need to bust the cache.
 
   mode: