Remove PSQLError.Code.clientClosesConnection #977

Job	Run time
linux-integration-and-dependencies (postgres:15)	7m 11s
linux-integration-and-dependencies (postgres:13)	10m 23s
linux-integration-and-dependencies (postgres:11)	7m 3s
linux-unit (swift:5.6-focal)	3m 9s
linux-unit (swift:5.7-jammy)	2m 39s
linux-unit (swift:5.8-jammy)	2m 51s
linux-unit (swiftlang/swift:nightly-5.9-jammy)	3m 53s
linux-unit (swiftlang/swift:nightly-main-jammy)	4m 16s
api-breakage	3m 40s
macos-all (postgresql@14, scram-sha-256, ~14.3)	3m 15s
macos-all (postgresql@14, scram-sha-256, 15.0-beta)	4m 10s
gh-codeql	6m 28s
	58m 58s

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