Upgrade psych to version 3.0.3

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We've upgraded a dependency and here is what you need to know:

name	version specification	new version
psych	~> 2.0	3.0.3

Please take a good look at the info here and the test results before merging this pull request.

What changed?

✳️ psych ( → 3.0.3) · Repo · Changelog

Commits

See the full diff on Github. The new version differs by 25 commits:

• bump version to 3.0.3.
• Properly map Psych flow styles to SnakeYAML flow styles.
• bump version to 3.0.3.pre4
• bump version to 3.0.3.pre3
• Fix NPE in initialization of PsychEmitter.
• bump up v3.0.3.pre2
• Fixup for c3c39bb7150fb548bf8f1837263d8c073e1a8cb8
• use newer style of JRuby ext loading when available
• Force loading of ./lib/psych/versions.rb to get updated consts.
• Update to SnakeYAML 1.23.
• Bump version to 3.0.3.pre1 for testing for jruby/jruby#5142.
• Update to SnakeYAML 1.21 to fix jruby/jruby#5098.
• Support SNAPSHOT builds of snakeyaml.
• Merge pull request #351 from zverok/document-options
• Document #dump options
• Removed date field from gemspec.
• no ID cache in Init functions
• Removed gitignore from gemspec files.
• Merge pull request #350 from nobu/no-stale-gitigore
• Removed stale .gitignore file [ci skip]
• Merge pull request #347 from olleolleolle/patch-1
• README: add ruby annotation to Example [ci skip]
• Add a predicate method to each node
• Merge pull request #345 from stomar/fallback-tests
• Add more test cases for fallback of Psych.load_file

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[depfu]

Closed in favor of #7.