There's a closed pull request on the void-packages repository

qt5/qt5-webengine updates
https://github.com/void-linux/void-packages/pull/31661

Description:
- qt5-webengine: update to 5.15.5.
- qt5: update to 5.15.3+20210625.

<!-- Mark items with [x] where applicable -->

[ci skip]

#### General

#### Have the results of the proposed changes been tested?
- [x] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me

<!--
If GitHub CI cannot be used to validate the build result (for example, if the
build is likely to take several hours), make sure to
[skip CI](https://github.com/void-linux/void-packages/blob/master/CONTRIBUTING.md#continuous-integration).
When skipping CI, uncomment and fill out the following section.
Note: for builds that are likely to complete in less than 2 hours, it is not
acceptable to skip CI.
-->
#### Does it build and run successfully? 
(Please choose at least one native build and, if supported, at least one cross build. More are better.)
- [x] I built this PR locally for my native architecture, (x86_64, x86_64-musl. i686)
- [ ] I built this PR locally for these architectures (if supported. mark crossbuilds):
  - [x] aarch64-musl
  - [x] armv7l
  - [x] armv6l-musl
  - [x] armv6l
  - [x] armv7l
  - [x] aarch64