pandoc: apply patch removing the usage of polyfill.io in the templates

If you output HTML with MathJax content Pandoc might uses a JS library
provided by cdn.polyfill.io which is now considered to be a bad actor.

https://sansec.io/research/polyfill-supply-chain-attack

`haskellPackages.pandoc` is not impacted, the concerned domain is not used

To reproduce the issue:
1. Create a file `math.tex` with the following content `$a^2 + b^2 = c^2$`
2. Call `pandoc` with `pandoc math.tex -s --mathjax -o ex.html`
3. Look at the injected scripts in `ex.html`

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