fix version to latest

src/context.ts

@@ -8,7 +8,7 @@ export interface Inputs {
 
 export function getInputs(): Inputs {
   return {
-    version: core.getInput('version'),
+    version: core.getInput('version') || 'latest',
     channel: core.getInput('channel'),
     context: core.getInput('context')
   };

src/main.ts

@@ -21,7 +21,7 @@ actionsToolkit.run(
 
     const install = new Install({
       runDir: runDir,
-      version: input.version || 'latest',
+      version: input.version,
       channel: input.channel || 'stable',
       contextName: input.context || 'setup-docker-action'
     });