Fix warnings for ruby4.0#20
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Fix ruby4.0 warnings like: ``` lib/rd/element.rb:135: warning: literal string will be frozen in the future (run with --debug-frozen-string-literal for more information ```
cgi/escape is available on ruby2.3 .
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Currently running
$ rake testwithruby 4.0.1 (2026-01-13 revision e04267a14b) +PRISM [x86_64-linux]causes many warnings, as shown in CI. Fix these.