fix: globally install pkg-size with npm

[privatenumber]

Was previously getting the following error:

  Build script found in package.json
  No lock file detected. Installing dependencies with npm
  Running build command: npm run build
  Build completed in 0.2s
  Installing pkg-size globally
  Error: The process '/usr/local/bin/yarn' failed with exit code 1
  Warning: Error: The process '/usr/local/bin/yarn' failed with exit code 1
      at Bc._setResult (/home/runner/work/_actions/pkg-size/action/v1/dist/index.js:7611:21)
      at Bc.CheckComplete (/home/runner/work/_actions/pkg-size/action/v1/dist/index.js:7597:18)
      at ChildProcess.<anonymous> (/home/runner/work/_actions/pkg-size/action/v1/dist/index.js:7496:23)
      at ChildProcess.emit (events.js:210:5)
      at maybeClose (internal/child_process.js:1021:16)
      at Process.ChildProcess._handle.onexit (internal/child_process.js:283:5)

Seems addPath has become deprecated for security reasons.

Also doesn't seem like npm i -g requires sudo or actions/setup-node as a prerequisite anymore, based on experiment.

[github-actions]

📊 Package size report   -0.03%↓

File	Before	After
dist/index.js	237.8 kB	-0.03%↓237.8 kB
Total (Includes all files)	247.6 kB	-0.03%↓247.5 kB
Tarball size	52.2 kB	-0.05%↓52.1 kB

Unchanged files

File	Size
LICENSE	1.1 kB
package.json	1.5 kB
README.md	7.1 kB

_{🤖 This report was automatically generated by pkg-size-action}

[privatenumber]

🎉 This PR is included in version 1.1.1 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀