Remove raising conect_timeout from 1 to 2 seconds

This will be removed in libpq of PostgreSQL-17 by this commit:
  postgres/postgres@105024a
The adjustment of connect_timeout from 1 to 2 seconds was anyway only relevant due to libpq's internal rounding, which doesn't apply to ruby.

lib/pg/connection.rb

@@ -653,8 +653,6 @@ def cancel
 		# Track the progress of the connection, waiting for the socket to become readable/writable before polling it
 
 		if (timeo = conninfo_hash[:connect_timeout].to_i) && timeo > 0
-			# Lowest timeout is 2 seconds - like in libpq
-			timeo = [timeo, 2].max
 			host_count = conninfo_hash[:host].to_s.count(",") + 1
 			stop_time = timeo * host_count + Process.clock_gettime(Process::CLOCK_MONOTONIC)
 		end

spec/pg/connection_spec.rb

@@ -377,7 +377,7 @@
 				end
 			end
 
-			expect( Time.now - start_time ).to be_between(1.9, 10).inclusive
+			expect( Time.now - start_time ).to be_between(0.9, 10).inclusive
 		end
 	end