fix(deps): update rust crate convert_case to 0.8.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
convert_case	dependencies	minor	0.7.0 -> 0.8.0
convert_case	workspace.dependencies	minor	0.7.1 -> 0.8.0

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Configuration

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

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

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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 proc_macros/Cargo.toml --workspace
error: current package believes it's in a workspace when it's not:
current:   /tmp/renovate/repos/github/vnghia/nghe/proc_macros/Cargo.toml
workspace: /tmp/renovate/repos/github/vnghia/nghe/Cargo.toml

this may be fixable by adding `proc_macros` to the `workspace.members` array of the manifest located at: /tmp/renovate/repos/github/vnghia/nghe/Cargo.toml
Alternatively, to keep it out of the workspace, add the package to the `workspace.exclude` array, or add an empty `[workspace]` table to the package's manifest.

[codecov]

❌ 3 Tests Failed:

Tests completed	Failed	Passed	Skipped
383	3	380	0

View the top 2 failed test(s) by shortest run time

nghe_backend file::audio::artist::tests::test_artists_upsert::compilation_1_true::update_artists_1_true

Stack Traces | 1.68s run time

No failure message available

nghe_backend file::audio::artist::tests::test_artists_upsert::compilation_2_false::update_artists_1_true

Stack Traces | 1.69s run time

No failure message available

View the full list of 1 ❄️ flaky tests

nghe_backend scan::scanner::tests::test_full_scan::full_1_true

Flake rate in main: 9.80% (Passed 92 times, Failed 10 times)

Stack Traces | 1.33s run time

No failure message available

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