feat(build) update build toolchain to Node 14 / npm 7 (#10145)

* feat(build) update build toolchain to Node 14 / npm 7

* squash: Updates ljm.

Co-authored-by: Дамян Минков <damencho@jitsi.org>

.github/workflows/ci.yml

     - uses: actions/checkout@v2
     - uses: actions/setup-node@v1
       with:
-        node-version: '12.x'
+        node-version: '14.x'
+    - run: npm i -g npm@7
     - run: npm install
     - name: Check if the git repository is clean
       run: exit $( git status --porcelain --untracked-files=no | head -255 | wc -l )

package.json

     "jquery-i18next": "1.2.1",
     "js-md5": "0.6.1",
     "jwt-decode": "2.2.0",
-    "lib-jitsi-meet": "github:jitsi/lib-jitsi-meet#bf0d5b5ec2da07696fd4ca1702a793bded616740",
+    "lib-jitsi-meet": "github:jitsi/lib-jitsi-meet#a5cc2321b8528c3117d366ef198a3428fe5bed67",
     "libflacjs": "github:mmig/libflac.js#93d37e7f811f01cf7d8b6a603e38bd3c3810907d",
     "lodash": "4.17.21",
     "moment": "2.29.1",
     "webpack-dev-server": "4.3.1"
   },
   "engines": {
-    "node": ">=12.0.0",
-    "npm": ">=6.0.0"
+    "node": ">=14.0.0",
+    "npm": ">=7.0.0"
   },
   "license": "Apache-2.0",
   "scripts": {