Update dependency com.github.vladimir-bukhtoyarov:bucket4j-core to v8

This MR contains the following updates:

Package	Type	Update	Change
com.github.vladimir-bukhtoyarov:bucket4j-core (source)	dependencies	major	7.6.1 -> 8.0.1

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Release Notes

vladimir-bukhtoyarov/bucket4j (com.github.vladimir-bukhtoyarov:bucket4j-core)

v8.0.1

https://bucket4j.com/7.6.0/release-notes.html

The features in release scope are following:

• #​279 Fix Verbose API
• Migration to JDK 11.
• Changing groupId to com.bucket4j.

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