fix(test): bump local Typesense image to 30.1

The integration spec at `spec/typesense/collections_spec.rb:156` expects
each field in the create-collection response to include `truncate_len`,
which was added to Typesense's field schema response in v30.x. The local
`docker-compose.yml` was still pinned to `typesense/typesense:29.0`, so
the spec failed locally with the field missing from the actual response:

    Failure/Error: expect(result['fields']).to eq(expected_fields)
    Diff: -  "truncate_len" => 100,

The README's compatibility table already states typesense-ruby v5.0.0
supports Typesense >= v30.0, and CI runs against v30, so this just
realigns local development with the gem's stated server compatibility.

After the bump:
- `bundle exec rspec` reports 151 examples, 0 failures, 16 pending
  (down from 27 pending; 11 specs that were skipped against Typesense
  29 are now exercised against 30.1).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: erimicel

docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   typesense:
-    image: typesense/typesense:29.0
+    image: typesense/typesense:30.1
     ports:
       - "127.0.0.1:8108:8108"
     volumes: