[Snyk] Upgrade gatsby-plugin-sharp from 3.6.0 to 3.15.0#378

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

snyk-upgrade-4635b3657ef6736ae5e663168fc20f01ibm-self-serve-assets/ibm-gsi-cloudnative-journey:snyk-upgrade-4635b3657ef6736ae5e663168fc20f01Copy head branch name to clipboard