dep: update vendored libxml2 to v2.13.5 (main) (#3322)

**What problem is this PR intended to solve?**

https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.13.5

CHANGELOG.md

@@ -8,7 +8,7 @@ Nokogiri follows [Semantic Versioning](https://semver.org/), please see the [REA
 
 ### Dependencies
 
-* [CRuby] Vendored libxml2 is updated to [v2.13.4](https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.13.4). @flavorjones
+* [CRuby] Vendored libxml2 is updated to [v2.13.5](https://gitlab.gnome.org/GNOME/libxml2/-/releases/v2.13.5). @flavorjones
 * [CRuby] Vendored libxslt is updated to [v1.1.42](https://gitlab.gnome.org/GNOME/libxslt/-/releases/v1.1.42). @flavorjones
 * [CRuby] Minimum supported version of libxml2 raised to v2.9.2 (released 2014-10-16) from v2.6.21. [#3232, #3287] @flavorjones
 * [JRuby] Minimum supported versino of Java raised to 8 (released 2014-03-18) from 7. [#3134] @flavorjones 

dependencies.yml

@@ -1,8 +1,8 @@
 ---
 libxml2:
-  version: "2.13.4"
-  sha256: "65d042e1c8010243e617efb02afda20b85c2160acdbfbcb5b26b80cec6515650"
-  # sha-256 hash provided in https://download.gnome.org/sources/libxml2/2.13/libxml2-2.13.4.sha256sum
+  version: "2.13.5"
+  sha256: "74fc163217a3964257d3be39af943e08861263c4231f9ef5b496b6f6d4c7b2b6"
+  # sha-256 hash provided in https://download.gnome.org/sources/libxml2/2.13/libxml2-2.13.5.sha256sum
 
 libxslt:
   version: "1.1.42"