deps: agentkeepalive@4.2.0

[nlf]

according to this issue node-modules/agentkeepalive#57 this update fixes a race condition that could cause timeouts to cause problems. bringing in this update is worth a shot to potentially fix another source of exit handler not called errors.

[npm-robot]

found 20 benchmarks with statistically significant performance improvements

• app-large: clean, lock-only, cache-only, cache-only:peer-deps, modules-only, no-lock, no-cache, no-modules, no-clean, no-clean:audit
• app-medium: clean, lock-only, cache-only, cache-only:peer-deps, modules-only, no-lock, no-cache, no-modules, no-clean, no-clean:audit

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	45.590 ±1.02	26.258 ±0.49	15.574 ±0.34	16.662 ±1.03	2.421 ±0.01	2.439 ±0.01	1.955 ±0.03	9.896 ±0.25	2.011 ±0.08	2.913 ±0.19
#4213	0.357 ±0.00	0.378 ±0.00	0.350 ±0.00	0.348 ±0.01	0.378 ±0.00	0.346 ±0.01	0.369 ±0.01	0.348 ±0.01	0.367 ±0.00	0.360 ±0.03

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	32.844 ±0.02	19.565 ±0.12	11.281 ±0.66	12.097 ±0.84	2.229 ±0.01	2.225 ±0.01	2.034 ±0.00	7.593 ±0.01	1.853 ±0.01	2.625 ±0.05
#4213	0.355 ±0.01	0.357 ±0.02	0.362 ±0.02	0.375 ±0.00	0.379 ±0.01	0.373 ±0.00	0.360 ±0.02	0.357 ±0.01	0.395 ±0.04	0.368 ±0.02