Fix: m stable returns latest production version, not just X.0 series

[Copilot]

m --stable was returning 8.0.15 when 8.2.1 was available. The implementation incorrectly limited "stable" to X.0 LTS series, ignoring MongoDB's rapid release versions (8.1.x, 8.2.x) which are also production-ready.

Changes

Version detection logic (display_latest_stable_version, display_latest_version):

• Changed stable to mean "latest without RC/alpha/beta suffix" instead of "latest X.0.z"
• Extract versions from JSON "version": field only (prevents false matches from URLs)
• Support MongoDB 10+ with multi-digit major version regex patterns
• Replace non-portable \d with [0-9] for POSIX compliance

Code cleanup:

• Remove redundant uniq after sort -u

Results

# Before
$ m --stable
8.0.15

# After  
$ m --stable
8.2.1

$ m --latest
8.2.2-rc0

Series-specific queries unchanged:

$ m --stable 8.0
8.0.15  # Correctly excludes 8.0.16-rc1

[!WARNING]

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• downloads.mongodb.com
  • Triggering command: curl -sSLf REDACTED -o /tmp/m-test-1761868523457/m/mongosh-2.5.6.tgz (dns block)
  • Triggering command: curl -sSLf REDACTED -o /tmp/m-test-1761868957375/m/mongosh-2.5.9.tgz (dns block)
  • Triggering command: curl -sSLf REDACTED -o /tmp/m-test-1761868957375/m/mongosh-2.5.6.tgz (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Incorrect versions identified for m latest and m stable</issue_title> <issue_description>> By the way, m latest didn't say MongoDB 8.2.2 doesn't exist for Linux x64, and m stable installed MongoDB version 8.0.15, even though version 8.2.1 is available. I would assume that it will install the latest available version, in this case 8.2.1

Originally posted by @sfn101 in #160</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes aheckmann/m#166

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