[DEVOPS-565]  appveyor:  disable branch cache updates (#2085)
[DEVOPS-565]  appveyor:  disable branch cache updates (#2085)


input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype