doc: update CHANGELOG

[skip ci]

CHANGELOG.md

@@ -10,11 +10,19 @@ Nokogiri follows [Semantic Versioning](https://semver.org/), please see the [REA
 
 * [CRuby] Vendored libxml2 is updated to address [CVE-2022-2309](https://nvd.nist.gov/vuln/detail/CVE-2022-2309), [CVE-2022-40304](https://nvd.nist.gov/vuln/detail/CVE-2022-40304), and [CVE-2022-40303](https://nvd.nist.gov/vuln/detail/CVE-2022-40303). See [GHSA-2qc6-mcvw-92cw](https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-2qc6-mcvw-92cw) for more information.
 
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 ### Dependencies
 
 * [CRuby] Vendored libxml2 is updated to [v2.10.3](https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.10.3) from v2.9.14.
 * [CRuby] Vendored libxslt is updated to [v1.1.37](https://gitlab.gnome.org/GNOME/libxslt/-/releases/v1.1.37) from v1.1.35.
 
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+### Fixed
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+* [CRuby] `Nokogiri::XML::Namespace` objects, when compacted, update their internal struct's reference to the Ruby object wrapper. Previously, with GC compaction enabled, a segmentation fault was possible after compaction was triggered. [[#2658](https://github.com/sparklemotion/nokogiri/issues/2658)] (Thanks, [@eightbitraptor](https://github.com/eightbitraptor) and [@peterzhu2118](https://github.com/peterzhu2118)!)
+* [CRuby] `Document#remove_namespaces!` now defers freeing the underlying `xmlNs` struct until the `Document` is GCed. Previously, maintaining a reference to a `Namespace` object that was removed in this way could lead to a segfault. [[#2658](https://github.com/sparklemotion/nokogiri/issues/2658)]
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 ## 1.13.8 / 2022-07-23
 
 ### Deprecated