Actions/deployment: specify bundler version

[leandrolanzieri]

For some time the deployment action seems to be failing. The error:

ERROR:  Error installing bundler:
	The last version of bundler (>= 0) to support your Ruby & RubyGems was 2.4.22. Try installing it with `gem install bundler -v 2.4.22`
	bundler requires Ruby version >= 3.0.0. The current ruby version is 2.7.8.225.

This tries applying the suggested solution of setting the bundler version to 2.4.22. Not sure we can test if this fixes the issue without merging...

[github-actions]

🚀 PR preview deployed to https://RIOT-OS-riot-os-org-preview-115.surge.sh

[MrKevinWeiss]

Let's give it a try.

[leandrolanzieri]

Thanks, it worked