chore(deps): update dependency tensorflow to v2.6.1 (GoogleCloudPlatform#7008)

[![WhiteSource Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [tensorflow](https://www.tensorflow.org/) | `==2.6.0` -> `==2.6.1` | [![age](https://badges.renovateapi.com/packages/pypi/tensorflow/2.6.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/tensorflow/2.6.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/tensorflow/2.6.1/compatibility-slim/2.6.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/tensorflow/2.6.1/confidence-slim/2.6.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Configuration

📅 **Schedule**: At any time (no schedule defined).

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

♻ **Rebasing**: Renovate will not automatically rebase this PR, because other commits have been found.

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

---

 - [ ] If you want to rebase/retry this PR, click this checkbox.

---

This PR has been generated by [WhiteSource Renovate](https://renovate.whitesourcesoftware.com). View repository job log [here](https://app.renovatebot.com/dashboard#github/GoogleCloudPlatform/python-docs-samples).

Author: renovate-bot

dataflow/gpu-examples/tensorflow-landsat/requirements.txt

@@ -1,4 +1,4 @@
 Pillow==8.4.0
 apache-beam[gcp]==2.31.0
 rasterio==1.2.9
-tensorflow==2.6.0
+tensorflow==2.6.1

dataflow/gpu-examples/tensorflow-minimal/requirements.txt

@@ -1,2 +1,2 @@
 apache-beam[gcp]==2.31.0
-tensorflow==2.6.0
+tensorflow==2.6.1

people-and-planet-ai/timeseries-classification/requirements.txt

@@ -3,4 +3,4 @@ apache-beam[gcp]==2.32.0
 google-cloud-aiplatform==1.4.2
 gunicorn==20.1.0
 pandas==1.3.4
-tensorflow==2.6.0
+tensorflow==2.6.1