chore(deps): update pnpm to v8.15.7 (#154)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -5,7 +5,7 @@
   "main": "./build/src/index.js",
   "types": "build/src/index.d.ts",
   "bin": "./build/src/bin/release-please.js",
-  "packageManager": "[email protected].6",
+  "packageManager": "[email protected].7",
   "engines": {
     "node": ">=18.0.0",
     "pnpm": ">=8"