chore(dependabot): bump diplomat-tool from 0.14.0 to 0.15.0 #2196

Job	Run time
Lint	43s
MSRV	21s
Test feature matrix	11m 18s
Test FFI (stable, ubuntu-latest)	54s
Documentation	29s
Test (stable, windows-latest)	1m 28s
Test (stable, macos-latest)	44s
Test (stable, ubuntu-latest)	29s
	16m 26s

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