Update docs to demonstrate specifying Qdrant version

[Anush008]

Hey 👋. Greetings from Qdrant.

QdrantContainer defaults to a specific version of Qdrant.

We had users coming from https://node.testcontainers.org/modules/qdrant/ not knowing how to specify a custom version. So this PR helps with demonstrating that.

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[cristianrgreco]

@Anush008 Tests are failing:

FAIL packages/modules/qdrant/src/qdrant-container.test.ts (17.112 s)
  QdrantContainer
    ✓ should connect to the client (7699 ms)
    ✓ should work with valid API keys (1360 ms)
    ✕ should fail for invalid API keys (1369 ms)
    ✓ should work with config files - valid API key (1352 ms)
    ✕ should work with config files - invalid API key (1332 ms)

  ● QdrantContainer › should fail for invalid API keys

    expect(received).rejects.toThrow(expected)

    Expected substring: "Forbidden"
    Received message:   "Unauthorized"

      at Object.fun [as getCollections] (../../../node_modules/@qdrant/openapi-typescript-fetch/dist/cjs/fetcher.js:172:23)
      at async QdrantClient.getCollections (../../../node_modules/@qdrant/js-client-rest/dist/cjs/qdrant-client.js:835:26)
      at Object.toThrow (../../../node_modules/expect/build/index.js:218:22)
      at Object.<anonymous> (src/qdrant-container.test.ts:45:45)

  ● QdrantContainer › should work with config files - invalid API key

    expect(received).rejects.toThrow(expected)

    Expected substring: "Forbidden"
    Received message:   "Unauthorized"

      at Object.fun [as getCollections] (../../../node_modules/@qdrant/openapi-typescript-fetch/dist/cjs/fetcher.js:172:23)
      at async QdrantClient.getCollections (../../../node_modules/@qdrant/js-client-rest/dist/cjs/qdrant-client.js:835:26)
      at Object.toThrow (../../../node_modules/expect/build/index.js:218:22)
      at Object.<anonymous> (src/qdrant-container.test.ts:74:45)

We should probably keep the version the same as in main, qdrant/qdrant:v1.8.1, otherwise it'll need to be a breaking change. This will be resolved by #867

[Anush008]

otherwise it'll need to be a breaking change

In this case, it was actually an update in the REST status message in the latter version.
Qdrant is backwards compatible.