Release 3.6.0

Fixes

• Fixed underflow in the modexp gas calculation by [@guidovranken]. (#883)
• Prevented subtraction underflow in th xcc module by [@guidovranken]. (#888)
• Fixed balance and gas overflows in the xcc module by [@guidovranken]. (#889)

Changes

• CI was updated by changing self-hosted runner to the GitHub heavy by [@aleksuss]. (#881)
• Removed a logic of fee calculation in the eth-connector by [@karim-en]. (#882)
• Version of the rust nightly was updated to 2023-12-15 by [@RomanHodulak]. (#885)