build: upload floating major and minor versions on release

[zimeg]

Summary

This PR uploads floating major and minor versions on release to avoid unexpected breaking changes when installing the latest version in downstream actions.

This might unlock the following for whatever the latest of v3 is:

curl -fsSL https://downloads.slack-edge.com/slack-cli/install.sh | bash -s -- -v 3.x.x

Preview

slack_cli_3.6.0-6-g859d4f1_linux_64-bit.tar.gz
slack_cli_3.6.x_linux_64-bit.tar.gz
slack_cli_3.x.x_linux_64-bit.tar.gz

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.93%. Comparing base (859d4f1) to head (df96c7a).
⚠️ Report is 227 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #199 +/- ##
==========================================
- Coverage 62.94% 62.93% -0.02% 
==========================================
Files 212 212 Lines 21782 21782 ==========================================
- Hits 13711 13708 -3 - Misses 7009 7011 +2 - Partials 1062 1063 +1 

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[zimeg]

📣 https://github.com/slackapi/slack-cli/releases/tag/v3.6.0-zimeg-build-x-version

[zimeg]

Some docs pages might find updates, but hoping to avoid merge conflicts as unrelated changes to installation scripts happen otherwise:

📚 https://docs.slack.dev/tools/slack-cli/guides/installing-the-slack-cli-for-mac-and-linux
📚 https://docs.slack.dev/tools/slack-cli/guides/installing-the-slack-cli-for-windows

[ewanek1]

Woah crazy fast... LGTM! 👏

[zimeg]

📫 Leaving a note to update soon-

[zimeg]

📝 todo: The build architecture is falling back to "universal" with the current semver comparisons!