Update dependencies of algebra, std and curves repos

[huyuncong]

Description

Use the latest version of algebra, std, and curves repos instead of v3.0.
In particular, there are the following changes:

• VariableBaseMSM => VariableBase
• FixedBaseMSM => FixedBase
• multi_scalar_mul => msm

There is one problem with test_rng() function in the std repo, and I do not know how to fix it.
The function returns "impl Rng" but it is not clear how to use it in the test of lib.rs.

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[weikengchen]

The problem regarding impl Rng is solved by a not very elegant solution: using Chacha20Rng throughout the test.

It is difficult to bypass because we need to pass a function that handles arbitrary Rng, but Rng cannot be boxed.
(RngCore can, but arkworks is using more than RngCore.)