Update ark-std requirement from ^0.3.0 to ^0.4.0

[dependabot[bot]]

Updates the requirements on ark-std to permit the latest version.

Changelog

Sourced from ark-std's changelog.

v0.4.0

Breaking changes

• #35 Change test_rng to return impl Rng, and make the output randomized by default when the std feature is set. Introduces a DETERMINISTIC_TEST_RNG environment variable that forces the old deterministic behavior when DETERMINISTIC_TEST_RNG=1 is set.

Features

Improvements

Bug fixes

v0.3.0

Breaking changes

• #32 Bump rand to 0.8 and remove the use of rand_xorshift.

Features

• #34 Re-export num_traits::{One, Zero} from ark-std.

Improvements

Bug fixes

Commits

• 6b7081d chore: Release ark-std version 0.4.0
• 857e09f update repository link
• eb2361f Update CHANGELOG to reflect a new version
• bd6f363 Release 0.4.0-alpha
• 7019830 fix a typo (#42)
• 05b7a19 Add iterable::Reverse. (#41)
• 082e281 Make iterable::Iterable shareable across threads. (#40)
• 4b907b6 Upgrade to edition 2021 (#39)
• 9501c25 make rand/getrandom dependency explicit with a feature (#37)
• 452f5d5 Add Iterable to support streaming (#38)
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like ark-std is up-to-date now, so this is no longer needed.