all: bump Go-1.22, drop Go-1.20

Signed-off-by: Sebastien Binet <binet@cern.ch>

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
     name: Build
     strategy:
       matrix:
-        go-version: [1.21.x, 1.20.x]
+        go-version: [1.22.x, 1.21.x]
         platform: [ubuntu-20.04, macos-latest]
     runs-on: ${{ matrix.platform }}
     env:
@@ -24,18 +24,18 @@ jobs:
 
     steps:
     - name: Install Go
-      uses: actions/setup-go@v3
+      uses: actions/setup-go@v5
       with:
         go-version: ${{ matrix.go-version }}
 
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         path: ${{ env.GOPATH }}/src/gonum.org/v1/plot
         fetch-depth: 1
 
     - name: Cache-Go
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         # In order:
         # * Module download cache

.github/workflows/codecov.yml

@@ -13,7 +13,7 @@ jobs:
     if: github.event.pull_request.merged == true
     strategy:
       matrix:
-        go-version: [1.21.x]
+        go-version: [1.22.x]
         platform: [ubuntu-latest]
 
     runs-on: ${{ matrix.platform }}
@@ -26,17 +26,17 @@ jobs:
 
     steps:
     - name: Install Go
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v5
       with:
         go-version: ${{ matrix.go-version }}
 
     - name: Checkout code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
       with:
         path: ${{ env.GOPATH }}/src/gonum.org/v1/plot
 
     - name: Cache-Go
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         # In order:
         # * Module download cache

.github/workflows/lint.yml

@@ -12,7 +12,7 @@ jobs:
         DISPLAY: ":99.0"
         EGL_PLATFORM: "x11"
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 1
     - name: cgo-dependencies

go.mod

@@ -1,6 +1,6 @@
 module gonum.org/v1/plot
 
-go 1.20
+go 1.21
 
 require (
 	gioui.org v0.2.0