Migrate to sqlite-vec

[mkasberg]

From the sqlite-vss README:

sqlite-vss is not in active development. Instead, my effort is now going towards sqlite-vec, which is a similar vector search SQLite extension, but should be much easier to install and use than sqlite-vss. See this blog post for more info.

This is not currently causing any problems, but we'll want to migrate jekyll_ai_related_posts to sqlite-vec to take advantage of easier installation and continued development!

[RalphHightower]

Hi Mike,

I found why I started getting the errors. Digging into the @Ruby/setup-ruby I noticed a Cache key. I had been seeing @github notices that Ubuntu was being switched from LTS 22.04 to LTS 24.04. That's what happened to me.

Status	Cache Key	Cache Size
SUCCESS	setup-ruby-bundler-cache-v6-ubuntu-22.04-x64-ruby-3.3.6-wd-/home/runner/work/blog/blog-with--without--only--v-1-Gemfile.lock-2a2b6477f2679ba38d6f2271bb9672663ba6775b21b257242da6072da7b2a35e	~36 MB (37919881 B)
FAILURE	setup-ruby-bundler-cache-v6-ubuntu-24.04-x64-ruby-3.3.6-wd-/home/runner/work/blog/blog-with--without--only--v-3-Gemfile.lock-4971da0746f58f57b53c6664c280dcfdd0ff058405aea41017f0417887a2794d	~36 MB (38133466 B)