Update dependency postgresql-charms-single-kernel to v16.3.4

Author: renovate[bot]

poetry.lock

@@ -21,7 +21,7 @@ charm-refresh = "^3.1.0.2"
 charmlibs-snap = "^1.0.1"
 charmlibs-systemd = "^1.0.0.post0"
 charmlibs-interfaces-tls-certificates = "^1.8.3"
-postgresql-charms-single-kernel = {extras = ["postgresql", "vm"], version = "16.3.2"}
+postgresql-charms-single-kernel = {extras = ["postgresql", "vm"], version = "16.3.4"}
 
 [tool.poetry.group.charm-libs.dependencies]
 # data_platform_libs/v0/data_interfaces.py