fix(deps): update dependency bull to v4.15.0

This MR contains the following updates:

Package	Type	Update	Change
bull	dependencies	minor	4.14.0 -> 4.15.0

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Release Notes

OptimalBits/bull (bull)

v4.15.0

Compare Source

Features

• queue: emit internal duplicated event (#​2754) (021ab7f)

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