Update Rust crate config to 0.15.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
config	dependencies	minor	0.14.0 -> 0.15.0

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Release Notes

rust-cli/config-rs (config)

v0.15.0

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Compatibility

• ConfigError is no longer exhaustive
• ConfigError::Parses type changed
• FileFormat is no longer exhaustive
• Deprecated functions removed
• Case insensitivity from 0.14.0 was reverted

Fixes

• Struct fields, variants, and lookup paths with uppercase letters can be used again (regression from 0.14.0)

v0.14.1

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Compatibility

• MSRV is now 1.75

Internal

• Remove dependency on lazy_static
• Update rust-ini from 0.19 to 0.20
• Switch from yaml-rust to yaml-rust2

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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