readme: update active branch 4.2

[edsiper]

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

Summary by CodeRabbit

• Documentation
  • Updated roadmap and maintenance information to reflect current development plans for v4.2.

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[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

Documentation updated to reflect active development focus on v4.2 instead of v4.1 in the README Roadmap & Maintenance section. No functional changes.

Changes

Cohort / File(s)	Summary
Documentation Updates README.md	Updated version references in Roadmap & Maintenance section to promote v4.2 as the active development branch instead of v4.1

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• maintenance: update branch and security EOL info #11339: Also updates repository branch/maintenance information to establish v4.2 as the active stable version line.

Suggested labels

docs-required

Suggested reviewers

• cosmo0920

Poem

🐰 A hop and a skip through the README we go,
Version and branches in a neat little row,
From four-point-one to four-point-two's gleam,
The docs now reflect the development team!

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📜 Recent review details

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 9c41374 and 82065b9.

📒 Files selected for processing (1)

• README.md

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