fix: timestamp with millis from react-native should be in UTC format

[marandaneto]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

fix: timestamp with millis from react-native should be already in UTC format

💡 Motivation and Context

timestamps were off in react-native events if not UTC.

💚 How did you test it?

unit test.

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• All tests passing

🔮 Next steps

release a new sentry-react-native version.

[codecov-commenter]

Codecov Report

Merging #456 into master will not change coverage.
The diff coverage is 44.44%.

@@            Coverage Diff            @@
##             master     #456   +/-   ##
=========================================
  Coverage     60.26%   60.26%           
  Complexity      816      816           
=========================================
  Files            93       93           
  Lines          3727     3727           
  Branches        359      359           
=========================================
  Hits           2246     2246           
  Misses         1328     1328           
  Partials        153      153           

Impacted Files	Coverage Δ	Complexity Δ
...y-core/src/main/java/io/sentry/core/DateUtils.java	52.38% <44.44%> (ø)	4.00 <3.00> (ø)

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[HazAT]

👍