fix pgvector installation on CI with submodules

[var77]

No description provided.

[github-actions]

Benchmarks

metric	old	new	pct change
recall (after create)	0.951	0.946	-0.53%
recall (after insert)	0.000	0.000	-
select tps	22287.227	23704.874	+6.36%
select bulk(100) tps	34.705	36.447	+5.02%
select latency (ms)	0.792 ± 1.649𝜎	0.855 ± 1.958𝜎	+7.95%
select bulk(100) latency (ms)	909.948 ± 118.369𝜎	847.432 ± 153.188𝜎	-6.87%
create latency (ms)	401926.841	403590.780	+0.41%
insert tps	438.335	475.279	+8.43%
insert bulk(100) tps	4.551	5.033	+10.60%
insert latency (ms)	72.304 ± 15.802𝜎	66.772 ± 14.996𝜎	-7.65%
insert bulk(100) latency (ms)	6844.376 ± 193.644𝜎	6242.629 ± 110.747𝜎	-8.79%
disk usage (bytes)	8192008192.000	8192008192.000	-

[codecov]

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