Bump version to 0.1.2.1
Bump version to 0.1.2.1

input-output-hk/pos-haskell-prototype,input-output-hk/pos-haskell-prototype,serokell/tw-rework-sketch,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/cardano-sl