Update dependencies

[moCello]

• dusk-bls12_381 -> v0.12
• dusk-jubjub -> v0.13

Notable changes in the new versions:

• jubjub point getters renamed
• BlsScalar::random changed slightly

[codecov]

Codecov Report

Merging #769 (ad3ad6f) into master (e03f199) will decrease coverage by 0.01%.
The diff coverage is 98.62%.

❗ Current head ad3ad6f differs from pull request most recent head 4d3aec5. Consider uploading reports for the commit 4d3aec5 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #769      +/-   ##
==========================================
- Coverage   84.86%   84.86%   -0.01%     
==========================================
  Files          57       57              
  Lines        4327     4333       +6     
==========================================
+ Hits         3672     3677       +5     
- Misses        655      656       +1     

Files	Coverage Δ
src/bit_iterator.rs	75.00% <ø> (+4.41%)	⬆️
src/commitment_scheme/kzg10/srs.rs	81.33% <ø> (-1.34%)	⬇️
src/composer/prover.rs	95.75% <ø> (ø)
src/fft/polynomial.rs	42.85% <ø> (-0.72%)	⬇️
src/permutation.rs	92.64% <ø> (ø)
src/proof_system/proof.rs	96.61% <ø> (ø)
src/proof_system/widget.rs	88.95% <ø> (ø)
src/util.rs	100.00% <100.00%> (+5.00%)	⬆️
tests/append_gate.rs	93.10% <100.00%> (ø)
tests/assert_point.rs	83.05% <100.00%> (ø)
... and 10 more

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[ureeves]

Very nice. LGTM