Quotations in plugin submission template aren't properly escaped.

[Hecter94]

When submitting a plugin via the template, the action fails to run properly if quotations are used in the template. See https://github.com/Hecter94/EndlessSky-PluginArchive/issues/167 and https://github.com/Hecter94/EndlessSky-PluginArchive/actions/runs/10423817843

Inputs should be properly sanitized before being used in an action.