Please update dependencies

[abrown]

When I install this package I see deprecation warnings:

npm WARN deprecated [email protected]: this library is no longer supported
npm WARN deprecated [email protected]: Please upgrade  to version 7 or higher.  Older versions may use Math.random() in certain circumstances, which is known to be problematic.  See https://v8.dev/blog/math-random for details.
npm WARN deprecated [email protected]: request has been deprecated, see https://github.com/request/request/issues/3142

[1tmb]

Related: https://github.com/SparkPost/node-sparkpost/issues/252

[1tmb]

Related: https://github.com/SparkPost/node-sparkpost/issues/249