Relax anthropic version pin to allow >=0.46.0,<1.0.0

[Br1an67]

Summary

Relax the anthropic version constraint from ^0.46.0 (which resolves to >=0.46.0,<0.47.0) to >=0.46.0,<1.0.0.

The current strict upper bound prevents users from installing marker-pdf alongside packages that require newer anthropic versions (e.g., pydantic-ai requires anthropic>=0.52.0).

The marker code only uses stable API features (anthropic.Anthropic, client.messages.create, RateLimitError, APITimeoutError), so newer 0.x versions should be compatible.

Closes #927

Changes

• Changed anthropic = "^0.46.0" to anthropic = ">=0.46.0,<1.0.0" in pyproject.toml

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[Br1an67]

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[NasonZ]

Bumping this — the current ^0.46.0 pin forces hard dep conflicts downstream with anthropic>=0.50 (extended thinking), >=0.52 (messages.parse native structured output), and with langchain/langgraph, pydantic-ai, and llamaindex which have all moved on.

The PR's compatibility note checks out: marker only touches Anthropic(), client.messages.create, RateLimitError, and APITimeoutError — all stable across the 0.46 → 0.96 anthropic range. A merge here unblocks quite a lot downstream.