update dependencies to address security vulnerabilities

[Dave Vieglais]

e.g., for isamples_webui:

5 vulnerabilities (1 low, 3 high, 1 critical)

To address all issues, run:
  npm audit fix

Run `npm audit` for details.

Often the vulnerabilities are from dependencies of dependencies, so may not be resolvable until the other maintainers address the problem.