Bump acorn from 8.1.1 to 8.12.1

Bumps [acorn](https://github.com/acornjs/acorn) from 8.1.1 to 8.12.1.
- [Commits](acornjs/acorn@8.1.1...8.12.1)

---
updated-dependencies:
- dependency-name: acorn
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -7,7 +7,7 @@
     "url": "https://github.com/goto-bus-stop/dash-ast/issues"
   },
   "devDependencies": {
-    "acorn": "8.1.1",
+    "acorn": "8.12.1",
     "astw": "^2.2.0",
     "estree-walk": "^2.2.0",
     "estree-walker": "^2.0.0",