Upgrade dependencies to resolve vulnerabilities

Upgrade NodeJS in CI to v14 due to v8 being EOL.
Upgrade Karma, Webpack, and Webpack-CLI by a major version to resolve
vulnerabilities.
Upgrade minor package dependencies where available.

.travis.yml

@@ -1,7 +1,7 @@
 dist: xenial
 language: node_js
 node_js:
-  - "8"
+  - "14"
 
 before_script:
   - export DISPLAY=:99.0
@@ -16,7 +16,7 @@ addons:
     token:
       secure: "${SONAR_CLOUD_TOKEN}"
 
-script: 
+script:
   - npm run lint && npm run test
   - if [ "$TRAVIS_PULL_REQUEST" = "false" ] && [ -z "$TRAVIS_TAG" ] && [ "$TRAVIS_REPO_SLUG" == "ibm/qpylib" ]; then sonar-scanner; fi # sonar only on non-PRs