Update rubyFeed regex to allow for v prefix of releases

[schinery]

Description

Update the rubyFeed regex to allow for v prefix of releases

Reasons

As flagged by @miyucy in https://github.com/CircleCI-Public/cimg-ruby/issues/174 the latest Ruby release is listed as v3.3.3.

The current regex:

curl --silent "https://github.com/ruby/ruby/tags.atom" | grep -E '(title)' | tail -n +2 | sed -e 's/^[ \t]*//' | sed -e 's/<title>//' -e 's/<\/title>//'

v3.3.3
3.3.2
3.1.6
3.4.0-preview1
3.3.1
3.2.4
3.1.5
3.0.7
3.2.3
3.3.0

With the added [v?]* to the regex the version list now looks like:

curl --silent "https://github.com/ruby/ruby/tags.atom" | grep -E '(title)' | tail -n +2 | sed -e 's/^[ \t]*//' | sed -e 's/<title>[v?]*//' -e 's/<\/title>//'
3.3.3
3.3.2
3.1.6
3.4.0-preview1
3.3.1
3.2.4
3.1.5
3.0.7
3.2.3
3.3.0

[maddieholtzer]

Thank you for handling this! I believe this should unblock my team in updating to 3.3.3