chore: bump to pg_net 0.19.3 #3085

Job	Run time
build-run-image (large-linux-arm, arm64)	5m 24s
build-run-image (macos-latest-xlarge, arm64)	4m 0s
build-run-image (large-linux-x86, amd64)	2m 12s
run-testinfra / prepare	44s
run-tests / prepare	47s
run-testinfra / test-ami-nix ("orioledb-17")	42m 29s
run-testinfra / test-ami-nix ("15")	28m 20s
run-testinfra / test-ami-nix ("17")	50m 47s
run-tests / build ("orioledb-17")	1m 41s
run-tests / build ("17")	1m 46s
run-tests / build ("15")	1m 42s
	2h 19m 52s

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