Bump rouge gem version to 3.26.0

What does this MR do?

Bump rouge gem version from 3.25.0 to 3.26.0 (Changelog)

We have two new lexers: one for OCL and one for ReScript. There are also fixes for the CMake, Crystal, JSL, Python, ReasonML and Rust lexers.

This new version also fixes an issue in Python lexer reported by @mlindsay (https://github.com/rouge-ruby/rouge/issues/1634).

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