fix: make bun resolve to given file path when an absolute path is given (#114)

* Make bun resolve to single file path when an absolute path is given

* Update test not to use the workspace folder

.github/workflows/test.yml

@@ -85,6 +85,10 @@ jobs:
             file: package.json
             run: |
               echo "$(jq '. += {"packageManager": "bun@1.1.0"}' package.json)" > package.json
+          - name: /foo/package.json (bun@1.1.0)
+            file: /foo/package.json
+            run: |
+              echo "$(jq '. += {"packageManager": "bun@1.1.0"}' package.json)" > /foo/package.json
           - name: package.json (yarn@bun@1.1.0)
             file: package.json
             run: |