fix(templates): bump otel version on two templates

[Hweinstock]

Problem

There is an old otel version pin in two templates that causes spans to be delivered to the aws/spans group instead of the runtimes own log group.

Solution

bump them to 0.18.0 (which changes this behavior).

Verification

• deployed an A2A and AGUI agent, and invoked each once.
• previously verified this spans now end up in the correct log group when working with other templates.

[agentcore-devx-automation]

Claude Security Review: no high-confidence findings. (run)

[agentcore-devx-automation]

AgentCore Harness Review

Verdict: Looks good

Simple, focused version bump of aws-opentelemetry-distro from ~= 0.17.0 to ~= 0.18.0 in the a2a-python-strands and agui-python-strands template pyproject.toml files. This aligns those two templates with the version already used by the other Python templates (mcp-python-fastmcp, agent-python-minimal, agent-python-strands, export-harness-python), and fixes the span-routing issue described in the PR. Version 0.18.0 is a real published release on PyPI. Author verified end-to-end by deploying and invoking A2A and AGUI agents. No test or telemetry concerns apply to a template dependency bump.

Nothing blocking — safe to merge.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.06%. Comparing base (4a23516) to head (81822ca).
⚠️ Report is 1 commits behind head on refactor.

Additional details and impacted files

@@            Coverage Diff            @@
##           refactor    #2290   +/-   ##
=========================================
  Coverage     97.06%   97.06%           
=========================================
  Files           569      569           
  Lines         39322    39322           
=========================================
  Hits          38167    38167           
  Misses         1155     1155           

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