docs: update changelog for iBotPeaches/Apktool#3856

Author: iBotPeaches

docs/unreleased.mdx

@@ -15,3 +15,4 @@ The changelog of the upcoming release, subject to change prior to finalization.
 - [[#3846](https://github.com/iBotPeaches/Apktool/pull/3846)] Upgrade `commons-io` to `2.19.0`.
 - [[#3844](https://github.com/iBotPeaches/Apktool/pull/3844)] Upgrade `commons-text` to `1.13.1`.
 - [[#3836](https://github.com/iBotPeaches/Apktool/pull/3836), [#3845](https://github.com/iBotPeaches/Apktool/pull/3845), [#3852](https://github.com/iBotPeaches/Apktool/pull/3852)] Upgrade `google/guava` to `33.4.7-jre`.
+- [[#3856](https://github.com/iBotPeaches/Apktool/pull/3856)] Upgrade `r8` to `8.9.35`.