Release 1.4.2

[kolyshkin]

A copy/paste from the changelog:

1.4.2 - 2026-04-02

Я — Земля! Я своих провожаю питомцев.

Fixed

• A regression in runc v1.3.0 which can result in a stuck runc exec or
  runc run when the container process runs for a short time. (a SIGCHLD race in signal handler setup (regression since runc 1.3.0) #5208,
  Fix SIGCHLD race in signal handler setup #5210, [1.4] Fix SIGCHLD race in signal handler setup #5216)
• Mount sources that need to be open on the host are now closed earlier during
  container start, reducing the total amount of used file descriptors and
  helping to avoid hitting the open files limit when handling many such mounts.
  (libct: close the mount source fd ASAP! #5177, [1.4] libct: close the mount source fd ASAP! #5201)

[Copilot]

Pull request overview

Bumps the project metadata to begin the 1.4.2 development cycle and records the 1.4.2 release notes in the changelog, aligning repository versioning and documentation with the published patch release.

Changes:

• Update VERSION from 1.4.1+dev to 1.4.2+dev.
• Add a 1.4.2 changelog entry (dated 2026-04-02) describing the included fixes.
• Update the “Unreleased 1.4.z” and 1.4.2 comparison links at the bottom of the changelog.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
VERSION	Advances the dev version marker to 1.4.2+dev.
CHANGELOG.md	Adds the 1.4.2 release section and updates release comparison links accordingly.

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[kolyshkin]

slightly improved changelog wording:

• s/opened/open/g
• it's not just idmapped mounts but also bind mounts not accessible from inside userns, so I changed to Mount sources that need to be open on the host