Bump libloading from 0.7.3 to 0.7.4

Bumps [libloading](https://github.com/nagisa/rust_libloading) from 0.7.3 to 0.7.4.
- [Release notes](https://github.com/nagisa/rust_libloading/releases)
- [Commits](nagisa/rust_libloading@0.7.3...0.7.4)

---
updated-dependencies:
- dependency-name: libloading
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]