Update Go to 1.20

Author: elgopher

.github/workflows/build.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        go: [ 1.18 ]
+        go: [ "1.20" ]
     env:
       DISPLAY: ':99.0'
     steps:
@@ -25,12 +25,12 @@ jobs:
           sudo apt-get update
           sudo apt-get install libasound2-dev libgl1-mesa-dev libxcursor-dev libxi-dev libxinerama-dev libxrandr-dev libxxf86vm-dev
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 0
 
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v4
         with:
           go-version: ${{ matrix.go }}
 

go.mod

@@ -1,6 +1,6 @@
 module github.com/elgopher/pi
 
-go 1.18
+go 1.20
 
 require (
 	github.com/hajimehoshi/ebiten/v2 v2.5.6