Update Rust crate argon2alt to v2

[oxide-renovate]

This PR contains the following updates:

Package	Type	Update	Change
argon2alt	dev-dependencies	major	1.0 -> 2.1

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Release Notes

sru-systems/rust-argon2 (argon2alt)

v2.1.0

Compare Source

• Add OWASP recommended configurations.
• Change default configuration from RFC9106 to OWASP (t=2, 19 MiB memory). For
  the 2.0.0 default configuration use Config::rfc9106. For the 1.0.x default
  configuration use Config::original.

v2.0.0

Compare Source

• Remove parallel execution to prevent UB.
• Add config settings from RFC9106.
• Use RFC9106 recommended settings as default.

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