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

swayimg: update to 3.3.
https://github.com/void-linux/void-packages/pull/52641

Description:
#### Testing the changes
- I tested the changes in this PR: **YES**

#### Local build testing
- I built this PR locally for my native architecture, (x86_64-musl)
- I built this PR locally for these architectures (if supported. mark crossbuilds):
  - armv6l-musl

#### Notes
Extra dependencies had to be added to fix `librsvg-2.0` not being found by `pkgconfig`.