Remove pnpm debug log

- it is contained within `node_modules/`, which is already ignored
- the previous versions, which were not in `node_modules/`, did not have a period at the beginning of the filename

Changelog with proof here:

ba4b2db1f2/pnpm/CHANGELOG.md (L3330)

Node.gitignore

@@ -5,7 +5,6 @@ npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
 lerna-debug.log*
-.pnpm-debug.log*
 
 # Diagnostic reports (https://nodejs.org/api/report.html)
 report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json