Bump ed25519 => v2; k256 => v0.13; signature => v2

[tony-iqlusion]

Closes: #1290

Bumps all of the above dependencies to their latest versions, which use the new signature v2 release:

RustCrypto/traits#1211

• Referenced an issue explaining the need for the change
• Updated all relevant documentation in docs
• Updated all code comments where relevant
• Wrote tests
• Added entry in .changelog/

[tony-iqlusion]

Note: there's a PR to use the signature v2 crate's traits with ed25519-consensus here:

penumbra-zone/ed25519-consensus#6

[tony-iqlusion]

Hmmm, the docs failure seems to be coming from generic-array:

https://github.com/informalsystems/tendermint-rs/actions/runs/4386941224/jobs/7681624555#step:4:290

[tony-iqlusion]

Appears to be a bug in the generic-array crate, unfortunately:

fizyk20/generic-array#133

I can see if I can configure the docs job to skip that crate.

[tony-iqlusion]

D'oh, cargo doc --exclude only works for crates in the same workspace.

Not sure how to fix the doc build without an upstream fix in generic-array. The best I can do is point it at that PR using patch.crates-io

[codecov-commenter]

Codecov Report

Merging #1285 (73cdb64) into main (60e10ab) will decrease coverage by 0.1%.
The diff coverage is 70.5%.

❗ Current head 73cdb64 differs from pull request most recent head 6f06f84. Consider uploading reports for the commit 6f06f84 to get more accurate results

@@           Coverage Diff           @@
##            main   #1285     +/-   ##
=======================================
- Coverage   64.1%   64.0%   -0.1%     
=======================================
  Files        271     271             
  Lines      24291   24330     +39     
=======================================
+ Hits       15584   15594     +10     
- Misses      8707    8736     +29     

Impacted Files	Coverage Δ
tendermint/src/public_key.rs	75.6% <25.0%> (+5.6%)	⬆️
tendermint/src/signature.rs	44.6% <33.3%> (-0.5%)	⬇️
tendermint/src/account.rs	82.5% <100.0%> (ø)
tendermint/src/crypto/default/signature.rs	92.0% <100.0%> (ø)
tendermint/src/test.rs	100.0% <100.0%> (ø)
tendermint/src/vote.rs	78.3% <100.0%> (ø)
tendermint/tests/alt_crypto.rs	92.5% <100.0%> (ø)

... and 6 files with indirect coverage changes

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[tony-iqlusion]

The build failure is an unrelated semi-recent nightly regression.

The docs build on nightly-2023-03-01, for example. (I'm not sure why it's using nightly in the first place?)

[tony-iqlusion]

Pinned the nightly used to build the docs and it passed, but that seems like an unrelated build failure which would impact any branch

[romac]

I'm not sure why it's using nightly in the first place?

I believe we are building the docs on nightly to match what docs.rs is doing.

[romac]

LGTM, thanks Tony!