Remove ESM-only get-port dependency path

[cristianrgreco]

Summary

• Downgrade get-port to the CommonJS-compatible 5.1.1 line.
• Add a Dependabot ignore rule so get-port is not automatically raised back to ESM-only major versions.
• Remove the ChromaDB module's dev dependency on @chroma-core/ollama, which pulled in an older published testcontainers package and reintroduced get-port@7 through a dev-only transitive path.
• Keep the ChromaDB embedding-function example covered by using a small local EmbeddingFunction that calls Ollama's /api/embed endpoint directly.

Verification

• npm install --ignore-scripts
• npm run format
• npm run lint
• npm run -w testcontainers build
• npm run -w @testcontainers/chromadb build

Test results

• Formatting and linting passed.
• The core testcontainers package build passed.
• The @testcontainers/chromadb package build passed after building the referenced core package.

Semver impact

Patch. This does not change the public API. The get-port usage in this repository only needs the default port-selection function, which is available in get-port@5.1.1; the downgrade removes the ESM-only package surface from CommonJS/Jest consumers. The ChromaDB dependency removal affects only module tests/docs and removes an unnecessary dev dependency path, not published runtime behavior.

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