clean up the version

npm_and_yarn/lib/dependabot/npm_and_yarn/version.rb

@@ -62,6 +62,7 @@ def self.semver_for(version)
 
       sig { override.params(version: VersionParameter).void }
       def initialize(version)
+        version = clean_version(version)
         @version_string = T.let(version.to_s, String)
         version = version.gsub(/^v/, "") if version.is_a?(String)
         @build_info = T.let(nil, T.nilable(String))
@@ -71,6 +72,18 @@ def initialize(version)
         super(T.must(version))
       end
 
+      sig { params(version: VersionParameter).returns(VersionParameter) }
+      def clean_version(version)
+        # Check if version is a string before attempting to match
+        # Matches @ followed by x.y.z (digits separated by dots)
+        if version.is_a?(String) && (match = version.match(/@(\d+\.\d+\.\d+)/))
+          return match[1] # Just "4.5.3"
+        end
+
+        # If version is not a string or no match found, return original version
+        version
+      end
+
       sig { override.params(version: VersionParameter).returns(Dependabot::NpmAndYarn::Version) }
       def self.new(version)
         T.cast(super, Dependabot::NpmAndYarn::Version)