chore(release): prepare v0.42.5 (#1048)

Author: nao1215

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.42.5] - 2026-09-28
+
 ### Fixed
 
 - lzop, unlzop and lzopcat no longer link GPL-2.0 code. Their LZO1X codec came from github.com/rasky/go-lzo, a GPL-2.0 port of the LZO library, which an Apache-2.0 binary cannot ship. The codec is now github.com/woozymasta/lzo (MIT, written from the MIT-licensed lzokay). The `.lzo` format is unchanged: files written by earlier releases and by the upstream lzop at every level still decompress, and upstream lzop decompresses what mimixbox writes. Compressed output may differ byte for byte from earlier releases.

README.md

@@ -483,8 +483,8 @@ There are 451 commands. Run `mimixbox --list` to see them on the terminal.
 MimixBox targets Linux only. The [Release Page](https://github.com/nao1215/mimixbox/releases) distributes a `tar.gz` archive for `linux/amd64` and `linux/arm64`, plus `.deb`, `.rpm`, and `.apk` packages for the same two architectures. The archive is named `mimixbox_<version>_linux_<arch>.tar.gz` and extracts into a directory containing the `mimixbox` binary, `LICENSE`, `README.md`, the dependency license texts under `THIRD_PARTY_LICENSES/`, and a self-contained `installer.sh` (with its `libshell.sh` helper). For example, on Linux (amd64):
 
 ```shell
-$ tar xf mimixbox_0.42.4_linux_amd64.tar.gz
-$ cd mimixbox_0.42.4_linux_amd64
+$ tar xf mimixbox_0.42.5_linux_amd64.tar.gz
+$ cd mimixbox_0.42.5_linux_amd64
 $ sudo ./installer.sh
 ```