ci: Remove PNPM usage

Author: aklinker1

.github/actions/setup/action.yml

@@ -4,5 +4,5 @@ runs:
   using: composite
   steps:
     - uses: oven-sh/setup-bun@v1
-    - run: pnpm install
+    - run: bun install
       shell: bash

package.json

@@ -30,7 +30,7 @@
     "typescript": "^5.3.3"
   },
   "simple-git-hooks": {
-    "pre-commit": "pnpm lint-staged"
+    "pre-commit": "bun lint-staged"
   },
   "lint-staged": {
     "*": "prettier --ignore-unknown --write"