chore(proxyd): bump go to 1.21 and update dependencies

proxyd/Dockerfile

-FROM golang:1.20.4-alpine3.18 as builder
+FROM golang:1.21.3-alpine3.18.4 as builder
 
 ARG GITCOMMIT=docker
 ARG GITDATE=docker
@@ -12,7 +12,7 @@ WORKDIR /app
 
 RUN make proxyd
 
-FROM alpine:3.18
+FROM alpine:3.18.4
 
 RUN apk add bind-tools jq curl bash git redis
 

proxyd/go.mod

 module github.com/ethereum-optimism/optimism/proxyd
 
-go 1.20
+go 1.21
 
 require (
 	github.com/BurntSushi/toml v1.3.2
@@ -26,19 +26,19 @@ require (
 	github.com/DataDog/zstd v1.5.5 // indirect
 	github.com/Microsoft/go-winio v0.6.1 // indirect
 	github.com/VictoriaMetrics/fastcache v1.12.1 // indirect
-	github.com/alicebob/gopher-json v0.0.0-20200520072559-a9ecdc9d1d3a // indirect
+	github.com/alicebob/gopher-json v0.0.0-20230218143504-906a9b012302 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/bits-and-blooms/bitset v1.10.0 // indirect
 	github.com/btcsuite/btcd/btcec/v2 v2.3.2 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/cockroachdb/errors v1.11.1 // indirect
 	github.com/cockroachdb/logtags v0.0.0-20230118201751-21c54148d20b // indirect
-	github.com/cockroachdb/pebble v0.0.0-20231018212520-f6cde3fc2fa4 // indirect
+	github.com/cockroachdb/pebble v0.0.0-20231020221949-babd592d2360 // indirect
 	github.com/cockroachdb/redact v1.1.5 // indirect
 	github.com/cockroachdb/tokenbucket v0.0.0-20230807174530-cc333fc44b06 // indirect
 	github.com/consensys/bavard v0.1.13 // indirect
 	github.com/consensys/gnark-crypto v0.12.1 // indirect
-	github.com/crate-crypto/go-kzg-4844 v0.6.0 // indirect
+	github.com/crate-crypto/go-kzg-4844 v0.7.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/deckarep/golang-set/v2 v2.3.1 // indirect
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.2.0 // indirect
@@ -49,7 +49,6 @@ require (
 	github.com/go-stack/stack v1.8.1 // indirect
 	github.com/gofrs/flock v0.8.1 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
-	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/gomodule/redigo v1.8.9 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/hashicorp/go-multierror v1.1.1 // indirect
@@ -59,7 +58,6 @@ require (
 	github.com/kr/pretty v0.3.1 // indirect
 	github.com/kr/text v0.2.0 // indirect
 	github.com/mattn/go-runewidth v0.0.15 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
 	github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 // indirect
 	github.com/mmcloughlin/addchain v0.4.0 // indirect
 	github.com/olekukonko/tablewriter v0.0.5 // indirect
@@ -73,7 +71,7 @@ require (
 	github.com/supranational/blst v0.3.11 // indirect
 	github.com/tklauser/go-sysconf v0.3.12 // indirect
 	github.com/tklauser/numcpus v0.6.1 // indirect
-	github.com/yuin/gopher-lua v0.0.0-20210529063254-f4c35e4016d9 // indirect
+	github.com/yuin/gopher-lua v1.1.0 // indirect
 	github.com/yusufpapurcu/wmi v1.2.3 // indirect
 	golang.org/x/crypto v0.14.0 // indirect
 	golang.org/x/exp v0.0.0-20231006140011-7918f672742d // indirect
@@ -82,6 +80,5 @@ require (
 	golang.org/x/text v0.13.0 // indirect
 	golang.org/x/tools v0.14.0 // indirect
 	google.golang.org/protobuf v1.31.0 // indirect
-	gopkg.in/natefinch/npipe.v2 v2.0.0-20160621034901-c1b8fa8bdcce // indirect
 	rsc.io/tmplfunc v0.0.3 // indirect
 )