bump encointer protocol pallets to 6.1

[brenzi]

Upgrade Encointer protocol to the latest enhancements:

noteworthy changes

• tolerate noshows without loss of reputation (tolerate noshows without loss of reputation encointer/pallets#373)
• protect bootstrapper reputation (protect bootstrapper reputation encointer/pallets#375)
  • bootstrappers can no longer use their ProofOfAttendance to register a fresh account as this is a vulnerability
  • upon unregistering, reputation is restored for bootstrappers too now
• increase meetup size target from 10 to 15 to be more resilient to noshows (Adjust MeetupSizeTarget to 15 encointer/pallets#372)

this change requires a state migration for the ceremonies pallet

[brenzi]

added above parameter change after first reviews ^^

[ggwpez]

/merge

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[ggwpez]

please approve #220

[brenzi]

/merge

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