[Snyk] Upgrade express from 4.17.1 to 4.21.1#15

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masterRobMakesThings/interactivevisualsbubbles:masterfrom

snyk-upgrade-c892bf8df875c373a9c3d6768eedcd15RobMakesThings/interactivevisualsbubbles:snyk-upgrade-c892bf8df875c373a9c3d6768eedcd15Copy head branch name to clipboard