[Snyk] Upgrade gatsby-plugin-sharp from 3.6.0 to 3.15.0#387

mjperrins wants to merge 1 commit intodev-advancedibm-self-serve-assets/ibm-gsi-cloudnative-journey:dev-advancedfrom

snyk-upgrade-6999bafeca2b46d01f9ab4d751861595ibm-self-serve-assets/ibm-gsi-cloudnative-journey:snyk-upgrade-6999bafeca2b46d01f9ab4d751861595Copy head branch name to clipboard