CI: add PostgreSQL 16

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         go-version: ["1.20", "1.21"]
-        pg-version: [11, 12, 13, 14, 15, cockroachdb]
+        pg-version: [11, 12, 13, 14, 15, 16, cockroachdb]
         include:
           - pg-version: 11
             pgx-test-database: "host=127.0.0.1 user=pgx_md5 password=secret dbname=pgx_test"
@@ -69,6 +69,16 @@ jobs:
             pgx-test-tls-conn-string: "host=localhost user=pgx_ssl password=secret sslmode=verify-full sslrootcert=/tmp/ca.pem dbname=pgx_test"
             pgx-ssl-password: certpw
             pgx-test-tls-client-conn-string: "host=localhost user=pgx_sslcert sslmode=verify-full sslrootcert=/tmp/ca.pem sslcert=/tmp/pgx_sslcert.crt sslkey=/tmp/pgx_sslcert.key dbname=pgx_test"
+          - pg-version: 16
+            pgx-test-database: "host=127.0.0.1 user=pgx_md5 password=secret dbname=pgx_test"
+            pgx-test-unix-socket-conn-string: "host=/var/run/postgresql dbname=pgx_test"
+            pgx-test-tcp-conn-string: "host=127.0.0.1 user=pgx_md5 password=secret dbname=pgx_test"
+            pgx-test-scram-password-conn-string: "host=127.0.0.1 user=pgx_scram password=secret dbname=pgx_test"
+            pgx-test-md5-password-conn-string: "host=127.0.0.1 user=pgx_md5 password=secret dbname=pgx_test"
+            pgx-test-plain-password-conn-string: "host=127.0.0.1 user=pgx_pw password=secret dbname=pgx_test"
+            pgx-test-tls-conn-string: "host=localhost user=pgx_ssl password=secret sslmode=verify-full sslrootcert=/tmp/ca.pem dbname=pgx_test"
+            pgx-ssl-password: certpw
+            pgx-test-tls-client-conn-string: "host=localhost user=pgx_sslcert sslmode=verify-full sslrootcert=/tmp/ca.pem sslcert=/tmp/pgx_sslcert.crt sslkey=/tmp/pgx_sslcert.key dbname=pgx_test"
           - pg-version: cockroachdb
             pgx-test-database: "postgresql://[email protected]:26257/pgx_test?sslmode=disable&experimental_enable_temp_tables=on"