Ignore mise local lock files

[scop]

Reasons for making this change

Like mise local configs, local lockfiles should not be added to git.

Links to documentation supporting these rule changes

https://mise.jdx.dev/dev-tools/mise-lock.html#local-lockfiles

If this is a new template

Link to application or project’s homepage: not a new template, but https://mise.jdx.dev

Merge and Approval Steps

• [x] Confirm that you've read the contribution guidelines and ensured your PR aligns
• [ ] Ensure CI is passing
• [ ] Get a review and Approval from one of the maintainers

[scop]

FYI @jdx