Don't run mill --version on pre script

We may not have a JVM ready yet

src/modules/mill.ts

@@ -33,25 +33,7 @@ export async function install(): Promise<void> {
       await tc.cacheFile(mill, 'mill', 'mill', millVersion)
     }
 
-    let output = ''
-
-    const code = await exec.exec('mill', ['--version'], {
-      silent: true,
-      ignoreReturnCode: true,
-      listeners: {
-        stdout(data) {
-          (output += data.toString())
-        }, errline: core.debug,
-      },
-    })
-
-    if (code !== 0) {
-      throw new Error('Unable to install Mill')
-    }
-
-    const version = output.split('\n')[0].replace(/^Mill Build Tool version /, '').trim()
-
-    core.info(`✓ Mill installed, version: ${version}`)
+    core.info(`✓ Mill installed, version: ${millVersion}`)
   } catch (error: unknown) {
     core.error((error as Error).message)
     throw new Error('Unable to install Mill')