Override Truffle version in Gnosis safe-contracts.

test/externalTests/common.sh

@@ -83,6 +83,13 @@ function download_project
     echo "Current commit hash: `git rev-parse HEAD`"
 }
 
+function force_truffle_version
+{
+    local repo="$1"
+
+    sed -i 's/"truffle":\s*".*"/"truffle": "^5.0.42"/g' package.json
+}
+
 function truffle_setup
 {
     local repo="$1"

test/externalTests/gnosis.sh

@@ -34,6 +34,8 @@ function gnosis_safe_test
     CONFIG="truffle.js"
 
     truffle_setup https://github.com/erak/safe-contracts.git development_060
+    force_truffle_version
+
     run_install install_fn
 
     replace_libsolc_call