Update dependency bunyan to ^1.8.15

[mend-for-github-com[bot]]

This PR contains the following updates:

Package	Type	Update	Change
bunyan	dependencies	patch	^1.8.12 -> ^1.8.15

By merging this PR, the below issues will be automatically resolved and closed:

Severity	CVSS Score	CVE	GitHub Issue
High	7.5	CVE-2022-24785	#245
High	7.5	CVE-2022-31129	#271

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Release Notes

trentm/node-bunyan (bunyan)

### [`v1.8.15`](https://redirect.github.com/trentm/node-bunyan/compare/1.8.14...1.8.15) [Compare Source](https://redirect.github.com/trentm/node-bunyan/compare/1.8.14...1.8.15) ### [`v1.8.14`](https://redirect.github.com/trentm/node-bunyan/compare/1.8.13...1.8.14) [Compare Source](https://redirect.github.com/trentm/node-bunyan/compare/1.8.13...1.8.14) ### [`v1.8.13`](https://redirect.github.com/trentm/node-bunyan/compare/1.8.12...1.8.13) [Compare Source](https://redirect.github.com/trentm/node-bunyan/compare/1.8.12...1.8.13)

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