Update Rust crate heck to 0.5.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
heck	dependencies	minor	0.3.2 -> 0.5.0

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Release Notes

withoutboats/heck (heck)

v0.5.0

• Add no_std support.
• Remove non-additive unicode feature. The library now uses char::is_alphanumeric
  instead of the unicode-segmentation library to determine word boundaries in all cases.

v0.4.1

Improvements:

• Add Train-Case support

v0.4.0

Breaking changes:

• Make unicode support optional (off by default). Enable the unicode crate
  feature if you need unicode support.
• Rename all traits from SomeCase to ToSomeCase, matching stds convention
  of beginning trait names with a verb (ToOwned, AsRef, …)
• Rename ToMixedCase to ToLowerCamelCase
• Rename ToCamelCase to ToUpperCamelCase
• Add ToPascalCase as an alias to ToUpperCamelCase

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Configuration

📅 Schedule: Branch creation - "before 3am on the first day of the month" (UTC), 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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[renovate]

⚠ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: Cargo.lock

Command failed: cargo update --config net.git-fetch-with-cli=true --manifest-path xtask/Cargo.toml --package heck@0.3.2 --precise 0.5.0
    Updating crates.io index
error: failed to select a version for the requirement `heck = "^0.3"`
candidate versions found which didn't match: 0.5.0
location searched: crates.io index
required by package `salsa-macros v0.16.0`
    ... which satisfies dependency `salsa-macros = "^0.16.0"` (locked to 0.16.0) of package `salsa v0.16.1`
    ... which satisfies dependency `salsa = "^0.16.1"` (locked to 0.16.1) of package `base_db v0.0.0 (/tmp/renovate/repos/github/oberblastmeister/lua-analyzer/crates/base_db)`
    ... which satisfies path dependency `base_db` (locked to 0.0.0) of package `ide_db v0.0.0 (/tmp/renovate/repos/github/oberblastmeister/lua-analyzer/crates/ide_db)`
    ... which satisfies path dependency `ide_db` (locked to 0.0.0) of package `lua-analyzer v0.0.0 (/tmp/renovate/repos/github/oberblastmeister/lua-analyzer/crates/lua-analyzer)`
perhaps a crate was updated and forgotten to be re-vendored?