navajo: Brings envelope::sync::Envelope in line with Envelope

[chanced]

currently, the async `Envelope trait's associated error types are:

pub trait Envelope {
    type EncryptError: core::fmt::Display + core::fmt::Debug + Send + Sync;
    type DecryptError: core::fmt::Display + core::fmt::Debug + Send + Sync;
    // ...
}

while the sync version is:

pub trait Envelope {
    type EncryptError: super::Error + Send + Sync;
    type DecryptError: super::Error + Send + Sync;
    // ...
}

This brnigs both in line by replacing super::Error with Display + Debug

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.03 ⚠️

Comparison is base (456cd2e) 73.34% compared to head (cf8bc54) 73.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
- Coverage   73.34%   73.31%   -0.03%     
==========================================
  Files          93       93              
  Lines       10916    10916              
==========================================
- Hits         8006     8003       -3     
- Misses       2910     2913       +3     

Impacted Files	Coverage Δ
navajo/src/envelope.rs	75.16% <ø> (ø)

... and 2 files with indirect coverage changes

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