fix: resolve lint issue in src/parse-rc-file.ts

[rosslh]

Tests currently aren't running on CI because lint is failing. This corrects linting errors in src/parse-rc-file.ts to ensure compliance with code style guidelines. It also resolves other auto-fixable lint errors.

[toddbluhm]

Thanks, I am currently looking at moving over to typescript-eslint (https://github.com/typescript-eslint/typescript-eslint). My ts-standard project and the whole standard community has not faired well these past few years and people have moved on.

My goal is to get the current iteration (v10) of the project updated for dependencies, release that, and then get the next major iteration (v11) supporting all the new js/ts stuff out.