Update module github.com/jackc/pgx/v4 to v4.18.2 [SECURITY]

Author: renovate[bot]

go.mod

@@ -17,10 +17,9 @@ require (
 	github.com/google/go-cmp v0.5.1
 	github.com/gotestyourself/gotestyourself v2.2.0+incompatible // indirect
 	github.com/iovisor/gobpf v0.0.0-20200504095308-90dbbdfb1358
-	github.com/jackc/pgx/v4 v4.6.0
+	github.com/jackc/pgx/v4 v4.18.2
 	github.com/joho/godotenv v1.3.0
 	github.com/kelseyhightower/envconfig v1.4.0
-	github.com/lib/pq v1.3.0 // indirect
 	github.com/mattn/go-colorable v0.1.8 // indirect
 	github.com/opencontainers/image-spec v1.0.1 // indirect
 	github.com/opencontainers/runc v0.1.1 // indirect
@@ -30,9 +29,7 @@ require (
 	github.com/shirou/gopsutil v2.20.4+incompatible
 	github.com/sirupsen/logrus v1.6.0 // indirect
 	github.com/weaveworks/tcptracer-bpf v0.0.0-20190731111909-cd53e7c84bac
-	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9 // indirect
-	golang.org/x/net v0.0.0-20201216054612-986b41b23924 // indirect
-	golang.org/x/sys v0.0.0-20201214210602-f9fddec55a1e
+	golang.org/x/sys v0.17.0
 	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1
 	gopkg.in/inconshreveable/log15.v2 v2.0.0-20200109203555-b30bc20e4fd1
 	gopkg.in/yaml.v2 v2.2.8 // indirect