Improve checking of `@Subscribe` receptors in Kotlin classes

[alexander-yevsyukov]

This PR improves checking of subscription receptors in Kotlin classes. Previously, a function declared in an internal class without access modifiers were considered as public, and caused corresponding warning.

Now, it is assumed effectively internal.

This PR also updates dependencies on validation, time, and base-types.

[codecov[bot]]

Codecov Report

Merging #1493 (40e380f) into master (7f703b4) will increase coverage by 0.01%. The diff coverage is 93.54%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1493 +/- ## ============================================ + Coverage 89.66% 89.67% +0.01% - Complexity 4896 4900 +4 ============================================ Files 631 631 Lines 15302 15309 +7 Branches 880 883 +3 ============================================ + Hits 13721 13729 +8 + Misses 1275 1273 -2 - Partials 306 307 +1 ```