This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [typing-extensions](https://redirect.github.com/python/typing_extensions) ([changelog](https://redirect.github.com/python/typing_extensions/blob/main/CHANGELOG.md)) | `==4.14.1` -> `==4.15.0` | [![age](https://developer.mend.io/api/mc/badges/age/pypi/typing-extensions/4.15.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/typing-extensions/4.14.1/4.15.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>python/typing_extensions (typing-extensions)</summary>

### [`v4.15.0`](https://redirect.github.com/python/typing_extensions/blob/HEAD/CHANGELOG.md#Release-4150-August-25-2025)

[Compare Source](https://redirect.github.com/python/typing_extensions/compare/4.14.1...4.15.0)

No user-facing changes since 4.15.0rc1.

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/). View the [repository job log](https://developer.mend.io/github/googleapis/python-spanner-sqlalchemy).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS44Mi43IiwidXBkYXRlZEluVmVyIjoiNDEuODIuNyIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [cachetools](https://redirect.github.com/tkem/cachetools) | `==6.1.0` -> `==6.2.0` | [![age](https://developer.mend.io/api/mc/badges/age/pypi/cachetools/6.2.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/cachetools/6.1.0/6.2.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>tkem/cachetools (cachetools)</summary>

### [`v6.2.0`](https://redirect.github.com/tkem/cachetools/blob/HEAD/CHANGELOG.rst#v620-2025-08-25)

[Compare Source](https://redirect.github.com/tkem/cachetools/compare/v6.1.0...v6.2.0)

\===================

- Improve general `RRCache` performance by storing cache keys in an
  additional sequence container.  Note that this will increase memory
  consumption.

- Add more unit tests.

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/). View the [repository job log](https://developer.mend.io/github/googleapis/python-spanner-sqlalchemy).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS44Mi43IiwidXBkYXRlZEluVmVyIjoiNDEuODIuNyIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

Add support for the NULL FILTERED index option:
https://cloud.google.com/spanner/docs/secondary-indexes#null-indexing-disable

Add a sample and test for using the parse_json function with SQLAlchemy.

Fixes #735

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>