chore: make sure to run the CI 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/actions/run-tests/action.yml

@@ -3,7 +3,7 @@ description: 'Runs go-redis tests against different Redis versions and configura
 inputs:
   go-version:
     description: 'Go version to use for running tests'
-    default: '1.23'
+    default: 'stable'
   redis-version:
     description: 'Redis version to test against'
     required: true

.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

.github/workflows/doctests.yaml

@@ -27,7 +27,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go-version: ["1.24"]
+        go-version: ["stable", "1.18"]
 
     steps:
       - name: Set up ${{ matrix.go-version }}

.github/workflows/test-redis-enterprise.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go-version: [1.24.x]
+        go-version: [stable, "1.18"]
         re-build: ["7.4.2-54"]
 
     steps: