chore(deps): update dependency tslint to v5.12.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
tslint	devDependencies	patch	5.12.0 -> 5.12.1	homepage, source

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Release Notes

palantir/tslint

### [`v5.12.1`](https://togithub.com/palantir/tslint/releases/5.12.1) [Compare Source](https://togithub.com/palantir/tslint/compare/5.12.0...5.12.1) #### :hammer_and_wrench: Bugfixes & enhancements - [bugfix] Revert breaking change to tslint:recommended, update tslint:latest ([#​4404](https://togithub.com/palantir/tslint/issues/4404)) - [bugfix] Correcting fixer for the [`increment-decrement`](https://palantir.github.io/tslint/rules/increment-decrement/) rule ([#​4415](https://togithub.com/palantir/tslint/issues/4415)) - [bugfix] Fix [`strict-type-predicates`](https://palantir.github.io/tslint/rules/strict-type-predicates/) with `unknown` ([#​4444](https://togithub.com/palantir/tslint/issues/4444)) - [bugfix] Skip linting of `.json` files to avoid problems with `--resolveJsonModule` compiler option ([#​4001](https://togithub.com/palantir/tslint/issues/4001)) - [bugfix] fix some [`quotemark`](https://palantir.github.io/tslint/rules/quotemark/) issues when using backticks with the `avoid-template` option ([#​4408](https://togithub.com/palantir/tslint/issues/4408)) - [enhancement] Mention file names in test script parse failures ([#​4397](https://togithub.com/palantir/tslint/issues/4397)) Thanks to our contributors! - Young Min Kim - Enes SOYLU - Thomas den Hollander - Adrian Leonhard

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