Update "da vbmeta X" instructions in "Root Phone" section of ReadMe

[k0mraid3]

It would appear that the latest version of MTKClient does not recognize the ... da vbmeta X argument.
It returns as follows when attempting to run python mtk.py da vbmeta 3
usage: mtk.py da [-h]
{efuse,generatekeys,meta,rpmb,peek,memdump,dumpbrom,poke,seccfg}
...
mtk.py da: error: argument subcmd: invalid choice: 'vbmeta' (choose from efuse, generatekeys, meta, rpmb, peek, memdump, dumpbrom, poke, seccfg)

What did ya change? Could we get this updated on the readme?

Whats the proper process in place of the old ... da vbmeta X command in the latest release?

This is the section in question, step 8:
https://github.com/bkerler/mtkclient?tab=readme-ov-file#root-the-phone-tested-with-android-9---12