[rb] Cast DevTools version to integer when used with Grid

Author: p0deje

rb/lib/selenium/webdriver/remote/driver.rb

@@ -45,8 +45,10 @@ def devtools_url
         end
 
         def devtools_version
-          capabilities['se:cdpVersion']&.split('.')&.first ||
-            raise(Error::WebDriverError, 'DevTools is not supported by the Remote Server')
+          cdp_version = capabilities['se:cdpVersion']&.split('.')&.first
+          raise Error::WebDriverError, 'DevTools is not supported by the Remote Server' unless cdp_version
+
+          Integer(cdp_version)
         end
 
         def process_options(options, capabilities)