RUSTSEC-2021-0153: `encoding` is unmaintained

[github-actions]

Details
Package	encoding
Version	0.2.33
Warning	unmaintained
URL	lifthrasiir/rust-encoding#127
Patched Versions	n/a

Last release was on 2016-08-28. The issue inquiring as to the status of the crate has gone unanswered by the maintainer.

Possible alternatives

• encoding_rs

[0x5A69656C]

I have gone upstream to gettext and made a PR to switch from encoding to encoding_rs.

justinas/gettext#22