chore: make sure to sure to run the GI on latest Go versions

Also, add Go 1.18 to the list of Go versions to test against since it's
still supported by go-redis.

Author: ccoVeille

.github/workflows/build.yml

@@ -22,8 +22,8 @@ jobs:
           - "8.2.x" # Redis CE 8.2
           - "8.0.x" # Redis CE 8.0
         go-version:
-          - "1.23.x"
-          - "1.24.x"
+          - "stable"    # The latest stable Go release
+          - "oldstable" # The previous Go release before stable
 
     steps:
       - name: Set up ${{ matrix.go-version }}
@@ -78,8 +78,9 @@ jobs:
             - "8.2.x" # Redis CE 8.2
             - "8.0.x" # Redis CE 8.0
           go-version:
-            - "1.23.x"
-            - "1.24.x"
+            - "stable"    # The latest stable Go release
+            - "oldstable" # The previous Go release before stable
+            - "1.18.x"    # Go 1.18 is the minimum supported version for go-redis (see go.mod)
 
     steps:
       - name: Checkout code