Update pinecone-plugin-assistant to >=3.0.1 (#561)

## Problem

The SDK was pinned to `pinecone-plugin-assistant==3.0.0`, which prevents
automatic updates to compatible patch and minor versions (e.g., 3.0.1,
3.0.2, 3.1.0).

## Solution

Updated the dependency specification to use a version range
(`>=3.0.1,<4.0.0`) instead of an exact pin. This allows the SDK to
automatically pick up compatible future versions while maintaining API
compatibility within the 3.x series.

## Changes

- **`pyproject.toml`**: Changed `pinecone-plugin-assistant==3.0.0` to
`pinecone-plugin-assistant>=3.0.1,<4.0.0`
- **`uv.lock`**: Regenerated lock file to resolve to version 3.0.1

## Impact

Users will automatically receive compatible updates to the assistant
plugin (3.0.1, 3.0.2, 3.1.0, etc.) when installing or updating the SDK,
without requiring a new SDK release. The version range ensures
compatibility within the 3.x major version while preventing breaking
changes from 4.0.0+.

## Breaking Changes

None. This change maintains backward compatibility and only affects how
future compatible versions are resolved.

Author: jhamon

pyproject.toml

@@ -33,7 +33,7 @@ dependencies = [
     "orjson>=3.0.0",
     "pinecone-plugin-interface>=0.0.7,<0.1.0",
     "python-dateutil>=2.5.3",
-    "pinecone-plugin-assistant==3.0.0",
+    "pinecone-plugin-assistant>=3.0.1,<4.0.0",
     "urllib3>=1.26.0; python_version<'3.12'",
     "urllib3>=1.26.5; python_version>='3.12'",
 ]