Updated main dependencies and Gradle

[jrgonzalezg]

I noticed that Arrow was still using the deprecated kotlin-stdlib-jre7 instead of kotlin-stdlib-jdk7 in arrow-generic which led to compiler warnings. So I took the time to fix that and update Gradle and some of the other dependencies. I also extracted some shared dependency versions to constants on the main build.gradle together with the other constants there. And I did not update kotlinx coroutines to the very last version due to not being sure if it will work on Android due to this issue: Kotlin/kotlinx.coroutines#510

[codecov]

Codecov Report

Merging #1008 into master will increase coverage by 0.72%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1008      +/-   ##
============================================
+ Coverage     47.03%   47.76%   +0.72%     
  Complexity      694      694              
============================================
  Files           320      320              
  Lines          8091     8091              
  Branches        848      753      -95     
============================================
+ Hits           3806     3865      +59     
  Misses         3942     3942              
+ Partials        343      284      -59

Impacted Files	Coverage Δ	Complexity Δ
...core/arrow-core/src/main/kotlin/arrow/core/Eval.kt	81.37% <0%> (+0.98%)	8% <0%> (ø)	⬇️
...arrow-optics/src/main/kotlin/arrow/optics/Prism.kt	61.9% <0%> (+1.19%)	0% <0%> (ø)	⬇️
...arrow-data/src/main/kotlin/arrow/data/Validated.kt	71.62% <0%> (+1.35%)	23% <0%> (ø)	⬇️
...cts-rx2/src/main/kotlin/arrow/effects/FlowableK.kt	55.4% <0%> (+1.35%)	9% <0%> (ø)	⬇️
...re/arrow-core/src/main/kotlin/arrow/core/Option.kt	64.4% <0%> (+1.69%)	22% <0%> (ø)	⬇️
...es-data/src/main/kotlin/arrow/instances/eithert.kt	63.63% <0%> (+1.81%)	0% <0%> (ø)	⬇️
...e/arrow-data/src/main/kotlin/arrow/data/OptionT.kt	61.53% <0%> (+1.92%)	10% <0%> (ø)	⬇️
...e/arrow-data/src/main/kotlin/arrow/data/WriterT.kt	49.01% <0%> (+1.96%)	7% <0%> (ø)	⬇️
...cts-reactor/src/main/kotlin/arrow/effects/FluxK.kt	70.21% <0%> (+2.12%)	9% <0%> (ø)	⬇️
...s-rx2/src/main/kotlin/arrow/effects/ObservableK.kt	70.21% <0%> (+2.12%)	9% <0%> (ø)	⬇️
... and 26 more

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[pakoito]

Looks green to me

[pakoito]

We're at 25 now, no biggie :P

[jrgonzalezg]

@pakoito I commented about that on the PR description. That one does not work on current Android versions.

[pakoito]

Note to self: read the bloody descriptions

[pakoito]

We should regenerate and commit the latest wrapper too

[jrgonzalezg]

@pakoito It has the latest wrapper too. And they don't always change it on new Gradle versions.

[pakoito]

Note to self: read the bloody diffs too. Good job @jrgonzalezg !