ExponentialBackoff left shift overflow

[YaroShkvorets]

Do you want to request a feature or report a bug?
bug

What is the current behavior?
When using ExponentialBackoff struct, it takes 32 attempts to overflow the left shift operator on u32 here.
With current parameters (base = 0.5s, ceiling = 45s) it takes about 20 minutes of missing internet connection for that to happen

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem.
Obvious looking at the code

What is the expected behavior?
Should continue with the delay == ceiling