🎩 What? Why?

Please describe your pull request.
The dependency between decidim-surveys and decidim-templates creates a strange rubygems dependency problem.
In a fresh system when gem install decidim:0.23.0 an error is generated because decidim-surveys is not able to resolve decidim-templates. Bundler on the other side, has no problems resolving the dependencies.
In fact we have many similar dependencies between decidim modules that cause no problem, i.e. decidim-accountability depends upon decidim-comments and comments is also declared after accountability in decidim.gemspec and there's no problem with that.

The key elements of the proposed solution are:

• make decidim-surveys.gemspec declare decidim-templates as a develoment_dependency
• remove decidim-templates dependency in decidim.gemspec

This PR also changes the version of release/0.23-stable to 0.23.1.rc1.

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📋 Checklist

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• ❓ CONSIDER adding a unit test if your PR resolves an issue.
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• ✔️ DO build locally before pushing.
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• ❌AVOID breaking the continuous integration build.
• ❌AVOID making significant changes to the overall architecture.

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