fix: Upgrade mcp minimum dependency to 1.23.0 for Tasks support

[clareliguori]

Description

The recent changes for MCP tasks support in ecfb864 assume that the Pydantic models from the MCP SDK have tasks attrs. I happened to have an older MCP 1.22.0 cached locally, and got errors like:

      | Traceback (most recent call last):
      |   File "/home/ANT.AMAZON.COM/liguori/code/library-book-renewal-agent/.venv/lib/python3.13/site-packages/strands/tools/mcp/mcp_client.py", line 746, in _async_background_thread
      |     and caps.tasks is not None
      |         ^^^^^^^^^^
      |   File "/home/ANT.AMAZON.COM/liguori/code/library-book-renewal-agent/.venv/lib/python3.13/site-packages/pydantic/main.py", line 1026, in __getattr__
      |     raise AttributeError(f'{type(self).__name__!r} object has no attribute {item!r}')
      | AttributeError: 'ServerCapabilities' object has no attribute 'tasks'
      +------------------------------------

This change upgrades to the minimum version where Tasks was added to the MCP SDK.

Type of Change

Bug fix

Testing

• I ran hatch run prepare

Checklist

• I have read the CONTRIBUTING document
• I have added any necessary tests that prove my fix is effective or my feature works
• I have updated the documentation accordingly
• I have added an appropriate example to the documentation to outline the feature, or no new docs are needed
• My changes generate no new warnings
• Any dependent changes have been merged and published

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