Update Rust crate arrayvec to v0.7.6 - abandoned

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This PR contains the following updates:

Package	Type	Update	Change
arrayvec	workspace.dependencies	patch	0.7.4 -> 0.7.6

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Release Notes

bluss/arrayvec (arrayvec)

v0.7.6

Compare Source

• Fix no-std build #​274

v0.7.5

Compare Source

• Add as_ptr and as_mut_ptr to ArrayString @​YuhanLiin #​260
• Add borsh serialization support by @​honzasp and @​Fuuzetsu #​259
• Move length field before before data in ArrayVec and ArrayString by @​JakkuSakura #​255
• Fix miri error for ZST case in extend by @​bluss
• implement AsRef for ArrayString by @​Zoybean #​218
• Fix typos in changelog by @​striezel #​241
• Add as_slice, as_mut_slice methods to IntoIter by @​clarfonthey #​224

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