Update all our dependencies

This leaves us with:

gsnedders@gsnedders-milk wpt-results-analysis % npm outdated
Package             Current           Wanted  Latest  Location                 Depended by
chai                  4.5.0            4.5.0   5.1.1  node_modules/chai        wpt-results-analysis
eslint               8.57.1           8.57.1  9.11.1  node_modules/eslint      wpt-results-analysis
flags                 0.1.3            0.1.3   0.2.2  node_modules/flags       wpt-results-analysis
node-fetch            2.7.0            2.7.0   3.3.2  node_modules/node-fetch  wpt-results-analysis
nodegit     0.28.0-alpha.28  0.28.0-alpha.28  0.27.0  node_modules/nodegit     wpt-results-analysis

Aside from nodegit (where we're using a pre-release version), the
later versions of all of these require use to adopt ESM.