Encointer runtime upgrade v12 2nd try

This is a resubmission of our runtime upgrade which has been whitelisted by fellowship already.
The resubmission is necessary because of several reasons:

referendum 9 would have enacted after 15M blocks instead of instantly
our joint referendum 17 with Statemine has been executed, but during that time, Encointer was no parachain because of:
referendum 243 passed, but failed to execute due to transition to gov2. This was fixed in referendum 25

So, now we are finally ready to execute our runtime upgrade with the help of the community voting in favor of this referendum.

runtime upgrade v12

Encointer has a new code upgrade which

allows participants to unregister from ceremony cycles. This will help us decrease noshows and increase security by doing so
allows reputables to endorse newbies. This is a massive improvement for growth. Before, only bootstrappers could endorse a one-off amount of newbies. Now, everybody that has recently proven their personhood can endorse a small number (~2-5, TBD) of newbies with every cycle. This is very much in line with the "word of mouth" growth strategy
upgrades our dependencies to polkadot-0.9.28

Detailed changes to our runtime and to our pallets

runtime release v12 in our GH repository

The call to be executed on the Encointer parachain with root privilege

authorizeUpgrade call on Encointer

the proposal

proposal call xcmPallet.send to be executed on Kusama yields hash 0x7776194086d1496a812cb61670080157d2f511cbcbaafddd44ff248a753788e7

whitelisting by fellowship

Has already passed and call 0x7776194086d1496a812cb61670080157d2f511cbcbaafddd44ff248a753788e7 has been whitelisted

public referendum

propose to dispatch the whitelisted call

dispatchProposal encodes to 0x2c03630001000100a50f0204060202286bee880102ccdfc804e0482f951ef7ad15fda0d38ead81c42e93a8276e60a45c663b8a3b91

note preimageD

hash = 0xd394967583efb9b8fe1dd4ad84d3bcb7c5382cae19319b2cfc1682e227ce76d3 len = 53

publicReferendum submission