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

.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