Chore: Update path-to-regex to v8.1.0

[harryby1149]

Checklist

• I have ensured my pull request is not behind the main or master branch of the original repository.
• I have rebased all commits where necessary so that reviewing this pull request can be done without having to merge it first.
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Kudos to @iambumblehead #188 . This Pull Request ups the version of path-to-regex dependency to latest. Updates options logic to pass new parsing option down to the layer object.

[Ngorror]

is it possible to release v13 also to npmjs with this PR?
now only v 12.0.1 is available.
I can install it via

{
    "dependencies": {
        "koa-router": "koajs/router"
    }
}

although I like more

{
    "dependencies": {
        "koa-router": "^13.0.0"
    }
}

:)

[iambumblehead]

@Ngorror #109 koa-router vs @koa/router

This module is forked from the original koa-router due to its lack of activity, and this repository is now the official version. Install with npm i @koa/router.

[iambumblehead]

String() is safer than .toString() because it does not error on primitive boolean and number values. Tests here have no runtime errors and perhaps string casting is un-needed

-      replace[key] = value.toString();
+      replace[key] = String(value);

[titanism]

@harryby1149 can you submit another PR that adds docs where necessary for pathIsRegexp and trailing?

[titanism]

v13.0.1 released https://github.com/koajs/router/releases/tag/v13.0.1