fix: use promiseSpawn.open instead of opener

[nlf]

• deps: remove opener, @npmcli/promise-spawn@6.0.1, @npmcli/run-script@5.1.1, @npmcli/git@4.0.3, pacote@15.0.5, which@3.0.0
• fix: use an absolute path to notepad.exe by default, correct docs
• fix: use promiseSpawn.open instead of opener

[npm-cli-bot]

found 1 benchmarks with statistically significant performance improvements

• app-medium: no-clean:audit

found 1 benchmarks with statistically significant performance regressions

• app-large: modules-only

timing results

app-large	clean	lock-only	cache-only	cache-only peer-deps	modules-only	no-lock	no-cache	no-modules	no-clean	no-clean audit
npm@8	46.786 ±2.42	27.100 ±0.68	34.463 ±14.52	27.880 ±3.66	3.960 ±0.03	4.202 ±0.14	3.340 ±0.06	17.258 ±0.33	3.376 ±0.08	4.737 ±0.05
#5789	46.543 ±3.44	26.862 ±0.14	31.956 ±9.90	28.675 ±0.31	4.412 ±0.06	4.329 ±0.00	3.362 ±0.03	17.448 ±0.46	3.229 ±0.13	5.180 ±0.62

app-medium	clean	lock-only	cache-only	cache-only peer-deps	modules-only	no-lock	no-cache	no-modules	no-clean	no-clean audit
npm@8	34.895 ±2.45	19.157 ±0.25	17.700 ±0.60	19.959 ±0.16	3.937 ±0.04	3.847 ±0.02	3.331 ±0.07	12.976 ±0.08	3.291 ±0.06	4.632 ±0.10
#5789	32.914 ±0.96	19.371 ±0.19	17.661 ±0.10	19.598 ±0.97	3.682 ±0.21	3.818 ±0.10	3.338 ±0.19	12.627 ±0.20	3.068 ±0.03	4.060 ±0.13