bump gradle

[marandaneto]

📢 Type of change

• Bugfix
• New feature
• Enhancement
• Refactoring

📜 Description

bump gradle to 5.6.3

💡 Motivation and Context

travis ci is hanging builds, bumping Gradle might help
known issues:
gradle/gradle#10729
gradle/gradle#10697
so if its one of them could fix it

💚 How did you test it?

📝 Checklist

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

🔮 Next steps

because of bug with "kotlinOptions"
gradle/gradle#11083

[codecov-io]

Codecov Report

Merging #58 into master will increase coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #58      +/-   ##
============================================
+ Coverage     38.13%   38.17%   +0.03%     
  Complexity      169      169              
============================================
  Files            51       51              
  Lines          1340     1336       -4     
  Branches         66       66              
============================================
- Hits            511      510       -1     
+ Misses          802      799       -3     
  Partials         27       27

Impacted Files	Coverage Δ	Complexity Δ
...re/src/main/java/io/sentry/core/SentryOptions.java	79.06% <0%> (+4.6%)	21% <0%> (ø)	⬇️

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