Downgrade supports-color to same version as eslint

[mantoni]

On node v23.1.0, invocations of eslint_d print this warning:

(node:21499) ExperimentalWarning: CommonJS module .../node_modules/debug/src/node.js is loading ES
Module .../node_modules/supports-color/index.js using require().                                          
Support for loading ES Module in require() is an experimental feature and might change at any time

The cause of this is that eslint_d has a direct dependency to supports-color@^9 which is ESM, while eslint depends on supports-color@^7 through chalk which is CJS.

This change downgrades supports-color to v7 to only have the CJS version installed. With this, the warning is not showing anymore.