chore: bump version to 9.0.0-dev

[erisu]

Motivation and Context

Prepare repo for next major development and release.

Description

Bump repo's version to 9.0.0-dev in:

• package.json
• VERSION
• bin/templates/cordova/version
• bin/templates/project/assets/www/cordova.js
• framework/build.gradle
• framework/src/org/apache/cordova/CordovaWebView.java

Testing

• npm t

Checklist

• I've run the tests to see all new and existing tests pass

[codecov-io]

Codecov Report

Merging #890 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #890   +/-   ##
=======================================
  Coverage   66.25%   66.25%           
=======================================
  Files          19       19           
  Lines        1861     1861           
=======================================
  Hits         1233     1233           
  Misses        628      628

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[brodycj]

LGTM

My one question is if we can think of a good (better) way to automate some of this work?

[erisu]

@brodybits I am sure we could use coho since it contains already a step that does the version bumping for the releases, but I was not investing the time to include it into my development process. For now, this manual process was much easier and faster.

Also, as a side note, I had been looking into the idea of removing all these version locations and condense it down between one or two file locations only.