Updated dependencies in the ckeditor5-angular repository

[psmyrek]

Suggested merge commit message (convention)

Internal: Updated dependencies.

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Additional information

• So far, to build this repository npm v6.x was used, so in this PR also npm v6.x was used.

• The npm audit status:

  • before: found 251 vulnerabilities (2 low, 129 moderate, 116 high, 4 critical)
  • after: found 76 vulnerabilities (2 low, 66 moderate, 8 high)

• The CKE5-related packages were not bumped yet.

• I tried to safely bump all other packages to their patch or minor versions.

• There are ugly warnings after calling the tests. They are caused by the bumped log4js package:

  

  To get rid of it, we could bump Karma to v6.x but for now this would be too big breaking change, so we must accept it for now.

• All tests pass, manual verification also passed so IMHO it looks safe 😅

[coveralls]

Pull Request Test Coverage Report for Build 434

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 419:	0.0%
Covered Lines:	141
Relevant Lines:	141

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💛 - Coveralls

[pomek]

LGTM.