support edit_uri_template by using at least mkdocs >=1.4.0

[pjungermann]

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Release https://github.com/mkdocs/mkdocs/releases/tag/1.4.0 introduces a new feature edit_uri_template which is a more flexible version of edit_uri.

I've prepared changes to utilize this at https://github.com/backstage/backstage.

Note: mkdocs v1.4.2 supports Python 3.11 https://github.com/mkdocs/mkdocs/releases/tag/1.4.2

Related: https://github.com/backstage/mkdocs-techdocs-core/issues/107

[pjungermann]

related to https://github.com/backstage/backstage/pull/16699

[pjungermann]

since mkdocs-techdocs-core v1.3, it requires

mkdocs>=1.5

This resolves this requirement for a more recent mkdocs version.

However, this packahe itself does not yet require mkdocs >= 1.4.0, and it contains uses of edit_uri e.g. at mkdocs_monorepo_plugin/edit_uri.py.

In order to support edit_uri_template instead, we would require adjustments at this package still.