Update codecov-action to v4 to use NodeJS 20 runtime

[github-actions[bot]]

Benchmarks

metric	old	new	pct change
recall (after create)	0.953	0.956	+0.31%
recall (after insert)	0.000	0.000	-
select tps	11516.315	13371.963	+16.11%
select bulk(100) tps	23.008	26.187	+13.82%
select latency (ms)	0.745 ± 2.137𝜎	0.805 ± 1.817𝜎	+8.05%
select bulk(100) latency (ms)	1368.883 ± 79.618𝜎	1182.666 ± 113.777𝜎	-13.60%
create latency (ms)	535156.135	455211.372	-14.94%
insert tps	558.361	562.445	+0.73%
insert bulk(100) tps	5.954	6.128	+2.91%
insert latency (ms)	56.364 ± 18.694𝜎	56.078 ± 17.960𝜎	-0.51%
insert bulk(100) latency (ms)	5186.156 ± 256.150𝜎	5059.805 ± 182.517𝜎	-2.44%
disk usage (bytes)	8196194304.000	8196194304.000	-

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:exclamation: No coverage uploaded for pull request base (main@a3daaca). Click here to learn what that means.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #278 +/- ## ======================================= Coverage ? 77.16% ======================================= Files ? 23 Lines ? 1848 Branches ? 476 ======================================= Hits ? 1426 Misses ? 218 Partials ? 204 ```