fix(renovate): support block-scalar mise sha256 values

[zeitlinger]

What changed

This updates the Renovate mise-action custom-manager regex to accept both plain sha256: scalars and YAML block-scalar forms such as sha256: >- followed by the digest on the next indented line.

It also mirrors the same matcher update in the repository's own .github/renovate.json5 and adds a regression test that compiles the stored regex and verifies both YAML layouts.

Why

A ryl rewrite changed the YAML line style for sha256, which caused the existing regex to stop matching the mise-action stanza. Once that happened, the Renovate update rule no longer tracked the digest reliably.

Impact

This makes the shared preset and the repo-local Renovate config more resilient to equivalent YAML scalar styles without broadening the accepted digest format beyond a 64-character lowercase SHA-256.

Validation

• cargo test
• mise run lint:fix
• mise run lint

[Copilot]

Pull request overview

This PR updates the Renovate mise-action custom-manager regex used by Flint’s shared Renovate preset (default.json) and the repo-local Renovate config (.github/renovate.json5) so it matches both plain sha256: scalars and YAML block-scalar forms (e.g., sha256: >- with the digest on the next indented line). It also adds a Rust regression test to ensure the stored regex compiles and matches both layouts.

Changes:

• Broadened the mise-action Renovate regex to accept optional YAML block-scalar indicators while keeping the digest constraint at exactly 64 lowercase hex chars.
• Mirrored the same regex update in .github/renovate.json5 to prevent drift from the shared preset.
• Added a unit test that compiles the regex from default.json and asserts it captures both the version and digest for plain vs block-scalar YAML samples.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
src/registry/tests.rs	Adds a regression test that compiles the stored Renovate regex and validates matching/capture behavior for both YAML scalar styles.
default.json	Updates the shared Renovate preset’s mise-action custom-manager regex to accept block-scalar sha256 values.
.github/renovate.json5	Mirrors the same mise-action regex update in the repo-local Renovate config to stay aligned with default.json.

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