fix create-stake-pool and delegate-stake scripts

nix/scripts.nix

@@ -217,7 +217,7 @@ in let
     --serial 1010101010 \
     --management-threshold 1 \
     --start-validity 0 > ''${STAKEPOOL_NAME}.cert
-    jcli certificate sign ''${STAKEPOOL_NAME}_owner_wallet.prv < ''${STAKEPOOL_NAME}.cert > ''${STAKEPOOL_NAME}.signcert
+    jcli certificate sign -k ''${STAKEPOOL_NAME}_owner_wallet.prv < ''${STAKEPOOL_NAME}.cert > ''${STAKEPOOL_NAME}.signcert
     jcli certificate get-stake-pool-id < ''${STAKEPOOL_NAME}.signcert > ''${STAKEPOOL_NAME}.id
     NODEID="$(cat ''${STAKEPOOL_NAME}.id)"
     VRFKEY="$(cat ''${STAKEPOOL_NAME}_vrf.prv)"
@@ -265,7 +265,7 @@ in let
     jcli certificate new stake-delegation \
       "$POOL" \
       "$SOURCE_PK" > ${rootDir}/stake_delegation.cert
-    jcli certificate sign "$SOURCE" < ${rootDir}/stake_delegation.cert > ${rootDir}/stake_delegation.signcert
+    jcli certificate sign -k "$SOURCE" < ${rootDir}/stake_delegation.cert > ${rootDir}/stake_delegation.signcert
 
     echo "Your delegation certificate is at ${rootDir}/stake_delegation.signcert."
     echo "You need to create a transaction to send the certificate to the blockchain."

nix/sources.json

@@ -29,10 +29,10 @@
         "homepage": null,
         "owner": "input-output-hk",
         "repo": "iohk-nix",
-        "rev": "d12e2c169b10b1da40815344761c1a029d51c499",
-        "sha256": "016fa09y4w54wgakiyj6vwls72pawhzs9dfn6v65wbrp8jbyx0b6",
+        "rev": "ae4232c5e206f2cde44248099c37d6d7dfd4f342",
+        "sha256": "1yjgjvm0jcnrwqsq5dl77mz01c3iwzr2bgadqv4lsmjy7bgbp1bf",
         "type": "tarball",
-        "url": "https://github.com/input-output-hk/iohk-nix/archive/d12e2c169b10b1da40815344761c1a029d51c499.tar.gz",
+        "url": "https://github.com/input-output-hk/iohk-nix/archive/ae4232c5e206f2cde44248099c37d6d7dfd4f342.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "js-chain-libs": {