…5525)

## Summary

- Fix `test_template_tracing_meta` failure on `starlette==1.0.0rc1`
across all Python versions (3.10, 3.13, 3.14, 3.14t)

Closes #5523

## Analysis

Starlette 1.0.0rc1 removed the deprecated `TemplateResponse(name,
context)` calling convention
([Kludex/starlette#3118](Kludex/starlette#3118),
commit [`96479da`](Kludex/starlette@96479da)).
The new required signature is `TemplateResponse(request, name,
context)`.

When the old-style call was made, the string template name was passed as
the `request` parameter and the context dict as `name`, which then got
used as part of a Jinja2 cache key tuple, causing `TypeError: unhashable
type: 'dict'`.

The fix branches on `STARLETTE_VERSION >= (1,)` to use the new API for
Starlette 1.0+ while keeping the old API for older versions.

## Test plan

- [x] `tox -e py3.14-starlette-v1.0.0rc1` — 71 passed
- [x] `tox -e py3.14-starlette-v0.52.1` — 71 passed (no regression)
- [ ] CI passes on all Web 1 jobs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>