Make this library build against more recent arkworks versions

[ValarDragon]

Description

I'm using this for a side project rn, had to update the repo to build with the more recent libraries. I thought I'd PR it in case others would benefit from it.

(Also has the nice side affect of no longer needing any crates patching)

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• Targeted PR against correct branch (master)
• Linked to Github issue with discussion and accepted design OR have an explanation in the PR that describes this work.
• Wrote unit tests
• Updated relevant documentation in the code
• Added a relevant changelog entry to the Pending section in CHANGELOG.md
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[Pratyush]

Thanks! Re: the failure wrt ark-sponge, the latter now lives in ark-crypto-primitives

[ValarDragon]

ah yeah, I was only testing with default feature flags, will fix those now!

[ValarDragon]

hrmm, will have to investigate this no-std issue later