deps: golang 1.21

Updates the go version used to 1.21

endpoint-monitor/Dockerfile

-FROM golang:1.20.7-alpine3.18 as builder
+FROM golang:1.21.1-alpine3.18 as builder
 
 RUN apk --no-cache add make jq bash git alpine-sdk
 

go.mod

 module github.com/ethereum-optimism/optimism
 
-go 1.20
+go 1.21
 
 require (
 	github.com/BurntSushi/toml v1.3.2

indexer/Dockerfile

-FROM --platform=$BUILDPLATFORM golang:1.20.7-alpine3.18 as builder
+FROM --platform=$BUILDPLATFORM golang:1.21.1-alpine3.18 as builder
 
 RUN apk add --no-cache make gcc musl-dev linux-headers git jq bash
 

op-batcher/Dockerfile

-FROM --platform=$BUILDPLATFORM golang:1.20.7-alpine3.18 as builder
+FROM --platform=$BUILDPLATFORM golang:1.21.1-alpine3.18 as builder
 
 ARG VERSION=v0.0.0
 

op-challenger/Dockerfile

-FROM --platform=$BUILDPLATFORM golang:1.20.7-alpine3.18 as builder
+FROM --platform=$BUILDPLATFORM golang:1.21.1-alpine3.18 as builder
 
 ARG VERSION=v0.0.0
 

op-heartbeat/Dockerfile

-FROM golang:1.20.7-alpine3.18 as builder
+FROM golang:1.21.1-alpine3.18 as builder
 
 RUN apk add --no-cache make gcc musl-dev linux-headers git jq bash
 

op-node/Dockerfile

-FROM --platform=$BUILDPLATFORM golang:1.20.7-alpine3.18 as builder
+FROM --platform=$BUILDPLATFORM golang:1.21.1-alpine3.18 as builder
 
 ARG VERSION=v0.0.0
 

op-program/Dockerfile

-FROM --platform=$BUILDPLATFORM golang:1.20.7-alpine3.18 as builder
+FROM --platform=$BUILDPLATFORM golang:1.21.1-alpine3.18 as builder
 
 ARG VERSION=v0.0.0
 

op-proposer/Dockerfile

-FROM --platform=$BUILDPLATFORM golang:1.20.7-alpine3.18 as builder
+FROM --platform=$BUILDPLATFORM golang:1.21.1-alpine3.18 as builder
 
 ARG VERSION=v0.0.0
 

op-ufm/Dockerfile

-FROM golang:1.20.4-alpine3.18 as builder
+FROM golang:1.21.1-alpine3.18 as builder
 
 ARG GITCOMMIT=docker
 ARG GITDATE=docker

op-wheel/Dockerfile

-FROM golang:1.20.7-alpine3.18 as builder
+FROM golang:1.21.1-alpine3.18 as builder
 
 RUN apk add --no-cache make gcc musl-dev linux-headers