bump pnpm to 8.6.12 (#1759)

## Checklist

- [ ] I have added
[tests](https://www.cursorless.org/docs/contributing/test-case-recorder/)
- [ ] I have updated the
[docs](https://github.com/cursorless-dev/cursorless/tree/main/docs) and
[cheatsheet](https://github.com/cursorless-dev/cursorless/tree/main/cursorless-talon/src/cheatsheet)
- [ ] I have not broken the cheatsheet

Author: pokey

package.json

@@ -53,5 +53,5 @@
       }
     }
   },
-  "packageManager": "pnpm@8.1.0"
+  "packageManager": "pnpm@8.6.12"
 }