Update Mocha to 8.2.1

The changes can be seen here between 8.0.1 and 8.2.1:
https://github.com/mochajs/mocha/releases

There are no breaking changes.

The upgrade will give us the ability to use global fixtures which
may speed up parallel mode. I'm also hoping this fixes a bug with
describe.skip() not working properly for parallel mode.

DISABLE_THIRD_PARTY_CHECK=Update Mocha

Bug: chromium:1101784
Change-Id: Ia052a80c0f6dcefb1a2f21444cdfd3789a3203f8
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2529149
Reviewed-by: Tim van der Lippe <tvanderlippe@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>

node_modules/is-callable/.github/workflows/lint.yml

@@ -1,11 +0,0 @@
-name: lint
-
-on: [push, pull_request]
-
-jobs:
-    lint:
-        runs_on: ubuntu-latest
-
-        strategy:
-            matrix:
-                node_version: 

node_modules/is-callable/.github/workflows/rebase.yml

@@ -1,15 +0,0 @@
-name: Automatic Rebase
-
-on: [pull_request]
-
-jobs:
-  _:
-    name: "Automatic Rebase"
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v1
-    - uses: ljharb/rebase@master
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}