Add node 16 to test matrix; drop node 10

[cspotcode]

Fixes #1311

[codecov]

Codecov Report

Merging #1312 (8ba191d) into main (03355c1) will decrease coverage by 0.62%.
The diff coverage is n/a.

Impacted Files	Coverage Δ
dist-raw/node-primordials.js	50.00% <0.00%> (-27.64%)	⬇️
dist-raw/node-errors.js	66.66% <0.00%> (-13.34%)	⬇️
dist-raw/node-options.js	78.37% <0.00%> (-10.20%)	⬇️
dist-raw/node-package-json-reader.js	84.21% <0.00%> (-9.73%)	⬇️
src/esm.ts	82.97% <0.00%> (-5.18%)	⬇️
src/repl.ts	73.50% <0.00%> (-2.72%)	⬇️
dist-raw/node-internal-fs.js	87.50% <0.00%> (-2.50%)	⬇️
src/tsconfigs.ts	92.30% <0.00%> (-0.55%)	⬇️
src/index.ts	78.09% <0.00%> (-0.48%)	⬇️
dist-raw/node-cjs-loader-utils.js	89.79% <0.00%> (-0.21%)	⬇️
... and 7 more