ci: let setup decide where the bundle comes from

Author: ariesclark

.github/workflows/build.yaml

@@ -5,13 +5,6 @@ on:
   pull_request:
   workflow_call:
     inputs:
-      artifact:
-        description: >-
-          Take the bundle from this run's artifacts rather than the latest
-          release. Only set it when the caller shares the run.
-        required: false
-        type: boolean
-        default: false
       ref:
         description: Ref of this repository to build.
         required: false
@@ -24,12 +17,14 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: vrchatapi/specification/.github/actions/setup@ci/modernise-actions
+      - uses: actions/checkout@v7
         with:
           repository: vrchatapi/vrchatapi-python
           ref: ${{ inputs.ref || github.ref }}
+
+      - uses: vrchatapi/specification/.github/actions/setup@ci/modernise-actions
+        with:
           bundle: openapi-legacy.yaml
-          artifact: ${{ inputs.artifact }}
           generator: 6.2.1
 
       - uses: actions/setup-python@v7