chore: bump Go version to 1.20 in workflow and modules

- Update Go version in the workflow from a range including 1.18 to 1.23 to only include 1.20 to 1.23
- Change the Go version in the go.mod file from 1.18 to 1.20

Signed-off-by: appleboy <appleboy.tw@gmail.com>

Author: appleboy

.github/workflows/go.yml

@@ -39,7 +39,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        go: [1.18, 1.19, "1.20", 1.21, 1.22, 1.23]
+        go: ["1.20", 1.21, 1.22, 1.23]
         include:
           - os: ubuntu-latest
             go-build: ~/.cache/go-build

go.mod

@@ -1,6 +1,6 @@
 module github.com/golang-queue/queue
 
-go 1.18
+go 1.20
 
 require (
 	github.com/appleboy/com v0.1.7