Update hex requirement from ~0.3 to ~0.4

Updates the requirements on hex to permit the latest version.

Commits

be0c32f fix: Bump to v0.4.2
4bc3e21 Fix compile error on older rustc versions
78359a8 Bump version (v0.4.1)
85fe726 README reworks and copyright dates update
83a0261 tests/serde: Fix test names
e8e2506 github-workflows: Improve GitHub Workflow tests.
3b8a77d Add serde support
b1d2318 Fix broken tests
764ee61 Fix Error::InvalidHexCharacter::to_string
f98cad4 Remove deprecated Error::description implementation
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IronCoreLabs / recrypt-rs

Update hex requirement from ~0.3 to ~0.4 #135