bump Go version in go.mod, stop testing on Go 1.21 (#4633)

* bump Go version in go.mod, stop testing on Go 1.21

* ci: update golangci-lint to v1.60.1

* ignore Go 1.23 0-RTT events in exhaustive linter

.clusterfuzzlite/Dockerfile

@@ -3,7 +3,7 @@ FROM gcr.io/oss-fuzz-base/base-builder-go:v1
 ARG TARGETPLATFORM
 RUN echo "TARGETPLATFORM: ${TARGETPLATFORM}"
 
-ENV GOVERSION=1.22.0
+ENV GOVERSION=1.23.0
 
 RUN platform=$(echo ${TARGETPLATFORM} | tr '/' '-') && \
   filename="go${GOVERSION}.${platform}.tar.gz" && \

.github/workflows/cross-compile.yml

@@ -4,7 +4,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go: [ "1.21.x", "1.22.x" ]
+        go: [ "1.22.x", "1.23.x" ]
     runs-on: ${{ fromJSON(vars['CROSS_COMPILE_RUNNER_UBUNTU'] || '"ubuntu-latest"') }}
     name: "Cross Compilation (Go ${{matrix.go}})"
     timeout-minutes: 30

.github/workflows/integration.yml

@@ -6,17 +6,17 @@ jobs:
       fail-fast: false
       matrix:
         os: [ "ubuntu" ]
-        go: [ "1.21.x", "1.22.x", "1.23.0-rc.2" ]
+        go: [ "1.22.x", "1.23.x" ]
         race: [ false ]
         include:
           - os: "ubuntu"
-            go: "1.22.x"
+            go: "1.23.x"
             race: true
           - os: "windows"
-            go: "1.21.x"
+            go: "1.23.x"
             race: false
           - os: "macos"
-            go: "1.21.x"
+            go: "1.23.x"
             race: false
     runs-on: ${{ fromJSON(vars[format('INTEGRATION_RUNNER_{0}', matrix.os)] || format('"{0}-latest"', matrix.os)) }}
     timeout-minutes: 30

.github/workflows/lint.yml

@@ -8,7 +8,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
-          go-version: "1.22.x"
+          go-version: "1.23.x"
       - name: Check that no non-test files import Ginkgo or Gomega
         run: .github/workflows/no_ginkgo.sh
       - name: Check for //go:build ignore in .go files
@@ -39,9 +39,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go: [  "1.21.x", "1.22.x" ]
+        go: [  "1.22.x", "1.23.x" ]
     env:
-      GOLANGCI_LINT_VERSION: v1.58.0
+      GOLANGCI_LINT_VERSION: v1.60.1
     name: golangci-lint (Go ${{ matrix.go }})
     steps:
       - uses: actions/checkout@v4

.github/workflows/unit.yml

@@ -7,7 +7,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ "ubuntu", "windows", "macos" ]
-        go: [ "1.21.x", "1.22.x", "1.23.0-rc.2" ]
+        go: [ "1.22.x", "1.23.x" ]
     runs-on: ${{ fromJSON(vars[format('UNIT_RUNNER_{0}', matrix.os)] || format('"{0}-latest"', matrix.os)) }}
     name: Unit tests (${{ matrix.os}}, Go ${{ matrix.go }})
     timeout-minutes: 30

go.mod

@@ -1,6 +1,6 @@
 module github.com/quic-go/quic-go
 
-go 1.21
+go 1.22
 
 require (
 	github.com/francoispqt/gojay v1.2.13

integrationtests/gomodvendor/go.mod

@@ -1,6 +1,8 @@
 module test
 
-go 1.21
+go 1.22
+
+toolchain go1.22.4
 
 // The version doesn't matter here, as we're replacing it with the currently checked out code anyway.
 require github.com/quic-go/quic-go v0.21.0

internal/handshake/crypto_setup.go

@@ -229,6 +229,9 @@ func (h *cryptoSetup) handleMessage(data []byte, encLevel protocol.EncryptionLev
 }
 
 func (h *cryptoSetup) handleEvent(ev tls.QUICEvent) (done bool, err error) {
+	//nolint:exhaustive
+	// Go 1.23 added new 0-RTT events, see https://github.com/quic-go/quic-go/issues/4272.
+	// We will start using these events when dropping support for Go 1.22.
 	switch ev.Kind {
 	case tls.QUICNoEvent:
 		return true, nil

interop/Dockerfile

@@ -5,7 +5,7 @@ RUN echo "TARGETPLATFORM: ${TARGETPLATFORM}"
 
 RUN apt-get update && apt-get install -y wget tar git
 
-ENV GOVERSION=1.22.0
+ENV GOVERSION=1.23.0
 
 RUN platform=$(echo ${TARGETPLATFORM} | tr '/' '-') && \
   filename="go${GOVERSION}.${platform}.tar.gz" && \

oss-fuzz.sh

@@ -3,12 +3,12 @@
 # Install Go manually, since oss-fuzz ships with an outdated Go version.
 # See https://github.com/google/oss-fuzz/pull/10643.
 export CXX="${CXX} -lresolv" # required by Go 1.20
-wget https://go.dev/dl/go1.22.0.linux-amd64.tar.gz \
+wget https://go.dev/dl/go1.23.0.linux-amd64.tar.gz \
   && mkdir temp-go \
   && rm -rf /root/.go/* \
-  && tar -C temp-go/ -xzf go1.22.0.linux-amd64.tar.gz \
+  && tar -C temp-go/ -xzf go1.23.0.linux-amd64.tar.gz \
   && mv temp-go/go/* /root/.go/ \
-  && rm -rf temp-go go1.22.0.linux-amd64.tar.gz
+  && rm -rf temp-go go1.23.0.linux-amd64.tar.gz
 
 (
 # fuzz qpack