fix: use ubuntu-latest bookworm instead of buster for tests (#5884)

* buster is now end of life
* apt-get update fails for some tests using ubuntu-latest
* buster cdn moved to archived domain

pkg/runner/runner_test.go

@@ -25,7 +25,7 @@ import (
 )
 
 var (
-	baseImage = "node:16-buster-slim"
+	baseImage = "node:24-bookworm-slim"
 	platforms map[string]string
 	logLevel  = log.DebugLevel
 	workdir   = "testdata"