big-mod-exp@v4.0.0

What's new

• Publish solana-big-mod-exp v4.0.0
• [big-mod-exp] Fix dependency scope and use u64 in place of pointers (#795) by @samkim-crypto
• Impl SIMD-0529: big_int_mod_exp syscall api refactoring (#710) by @zz-sol
• Make BigModExpParams layout independent of target (#713) by @nagisa
• Use doc_cfg instead of doc_auto_cfg (#411) by @joncinque
• Add [package.metadata.docs.rs] and doc_auto_cfg (#350) by @joncinque