chore: Fix spelling in tests

Merge https://github.com/google/adk-python/pull/3402

This PR corrects misspellings identified by the [check-spelling action](https://github.com/marketplace/actions/check-spelling)

Note: while I use tooling to identify errors, the tooling doesn't _actually_ provide the corrections, I'm picking them on my own. I'm a human, and I may make mistakes.

### Testing Plan

The misspellings have been reported at https://github.com/jsoref/adk-python/actions/runs/19056081305/attempts/1#summary-54426435973

The action reports that the changes in this PR would make it happy: https://github.com/jsoref/adk-python/actions/runs/19056081446/attempts/1#summary-54426436321

**Unit Tests:**

- [ ] I have added or updated unit tests for my change.
- [ ] All unit tests pass locally.

_Please include a summary of passed `pytest` results._

**Manual End-to-End (E2E) Tests:**

_Please provide instructions on how to manually test your changes, including any
necessary setup or configuration. Please provide logs or screenshots to help
reviewers better understand the fix._

### Checklist

- [x] I have read the [CONTRIBUTING.md](https://github.com/google/adk-python/blob/main/CONTRIBUTING.md) document.
- [x] I have performed a self-review of my own code.
- [ ] I have commented my code, particularly in hard-to-understand areas.
- [ ] I have added tests that prove my fix is effective or that my feature works.
- [ ] New and existing unit tests pass locally with my changes.
- [ ] I have manually tested my changes end-to-end.
- [ ] Any dependent changes have been merged and published in downstream modules.

### Additional context

- https://github.com/google/adk-python/pull/3382#issuecomment-3488654110

Co-authored-by: Liang Wu <wuliang@google.com>
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/adk-python/pull/3402 from jsoref:spelling-tests 3cf0439d0584e4557179c25596aadf3b5b7c3fa8
PiperOrigin-RevId: 829035089

tests/unittests/tools/openapi_tool/openapi_spec_parser/test.yaml

@@ -634,7 +634,7 @@ components:
         requestId:
           description: |-
             The client-generated unique ID for this request.
-            Clients should regenerate this ID for every new request. If an ID provided is the same as for the previous request, the request is ignored.
+            Clients should regenerate this ID for every new request. If an ID provided is the same as the previous request, the request is ignored.
           type: string
         status:
           $ref: "#/components/schemas/ConferenceRequestStatus"