Minecraft wiki entry for Pack_format, associated text: pack_format Minecraft version
"pack_format": 4 1.13–1.14.4
"pack_format": 5 1.15–1.16.1
"pack_format": 6 1.16.2–1.16.5
"pack_format": 7 1.17.x
"pack_format": 8 1.18–1.18.1
"pack_format": 9 1.18.2