Increase spec version for SpaceDock pull requests

[HebaruSan]

In #234 the SpaceDockAdder gained the ability to submit netkans with filter_regexp, but spec_version was still always v1.4.

In KSP-CKAN/CKAN#3494 we started enforcing the requirement that spec_version must be v1.10 or greater for filter_regexp.

The SpaceDockAdder submitted KSP-CKAN/NetKAN#8958 for a mod with a .mdb file that should be filtered out, so filter_regexp was included in the install stanza, and the initial inflation failed:

Now the spec_version is increased to v1.10 so we can use filter_regexp if we need to. I don't think there's any real disadvantage to this even if filter_regexp is not used for a particular pull request, since we never made a particular effort to decrease it from v1.4 to 1 when that would have been possible.