chore: Bump & align testcontainers to ^8.12

[ovr]

Hello!

Previously We had a problem with a broken testcontainers library, and I've locked it to 7.12.1 in https://github.com/cube-js/cube.js/commit/a13b9fb4c8c8ab59e8f9dc5ac78a583d408f5946. The biggest problem with that approach is that some components require 8, but resolution resolves it to 7.

Thanks

[codecov[bot]]

Codecov Report

Merging #5085 (983ee8f) into master (990802c) will decrease coverage by 13.95%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #5085       +/-   ##
===========================================
- Coverage   74.18%   60.23%   -13.96%     
===========================================
  Files         266      139      -127     
  Lines       30568    11487    -19081     
  Branches     2803     2803               
===========================================
- Hits        22677     6919    -15758     
+ Misses       7600     4277     -3323     
  Partials      291      291               

Flag	Coverage Δ
cube-backend	60.23% <ø> (ø)
cubesql	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...gine/information_schema/postgres/pg_description.rs
...rmation_schema/postgres/referential_constraints.rs
rust/cubesql/cubesql/src/compile/rewrite/cost.rs
...engine/information_schema/postgres/pg_attribute.rs
.../engine/information_schema/postgres/pg_database.rs
rust/cubesql/pg-srv/src/pg_type.rs
...cubesql/cubesql/src/compile/rewrite/rules/order.rs
rust/cubesql/cubesql/src/sql/postgres/pg_type.rs
...nt/src/models/v1_load_request_query_filter_item.rs
...ile/engine/information_schema/postgres/pg_index.rs
... and 117 more

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