build: update image(s) version

- bun: (canary) v1.3.8-canary.20260202.1, (latest) v1.3.8
- nodejs:
current: v25.6.0
krypton: v24.13.0
jod: v22.22.0
iron: v20.20.0
- distro: alpine,debian-slim,debian

Author: github-actions[bot]

versions.json

@@ -6,7 +6,7 @@
   "nodejs": {
     "25": {
       "name": "current",
-      "version": "v25.5.0"
+      "version": "v25.6.0"
     },
     "24": {
       "name": "krypton",