[Snyk] Upgrade gatsby-plugin-sharp from 3.6.0 to 3.15.0#370

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

snyk-upgrade-2121a1f9961da7f95fd99c1f7c2c1eb4ibm-self-serve-assets/ibm-gsi-cloudnative-journey:snyk-upgrade-2121a1f9961da7f95fd99c1f7c2c1eb4Copy head branch name to clipboard