Fix workspace resolver warning

[acheroncrypto]

Problem

cargo commands give a warning about the workspace resolver in newer versions of Rust.

warning: some crates are on edition 2021 which defaults to `resolver = "2"`, but virtual workspaces default to `resolver = "1"`
note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest

Summary of changes

Specify resolver = "2" in:

• Repository Cargo.toml
• Workspace Cargo.toml crated using anchor init
• tests/*/Cargo.toml

[vercel]

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