Remove incorrect self dev dep from rollup plugin (#696)

Author: mattcompiles

packages/rollup-plugin/package.json

@@ -21,7 +21,6 @@
     "@fixtures/themed": "*",
     "@rollup/plugin-json": "^4.1.0",
     "@vanilla-extract/css": "^1.7.0",
-    "@vanilla-extract/rollup-plugin": "^1.0.2",
     "esbuild": "^0.11.16",
     "rollup": "^2.7.0",
     "rollup-plugin-esbuild": "^4.9.1"