Fixed CI

Author: ankane

.github/workflows/build.yml

@@ -16,6 +16,6 @@ jobs:
           cd pgvector
           make
           sudo make install
-      - run: zef install DB::Pg
+      - run: zef install DBIish DB::Pg
       - run: raku dbiish.raku
       - run: raku dbpg.raku

README.md

@@ -112,7 +112,7 @@ To get started with development:
 git clone https://github.com/pgvector/pgvector-raku.git
 cd pgvector-raku
 createdb pgvector_raku_test
-zef install DB::Pg
+zef install DBIish DB::Pg
 raku dbiish.raku
 raku dbpg.raku
 ```