chore(deps): update dependency django-environ to v0.7.0 (GoogleCloudPlatform#6683)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [django-environ](https://django-environ.readthedocs.org) ([source](https://togithub.com/joke2k/django-environ), [changelog](https://django-environ.readthedocs.org/en/latest/changelog.html)) | `==0.6.0` -> `==0.7.0` | [![age](https://badges.renovateapi.com/packages/pypi/django-environ/0.7.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/pypi/django-environ/0.7.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/pypi/django-environ/0.7.0/compatibility-slim/0.6.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/pypi/django-environ/0.7.0/confidence-slim/0.6.0)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>joke2k/django-environ</summary>

### [`v0.7.0`](https://togithub.com/joke2k/django-environ/blob/master/CHANGELOG.rst#v070---11-September-2021)

[Compare Source](https://togithub.com/joke2k/django-environ/compare/v0.6.0...v0.7.0)

Added
\+++++

-   Added support for negative float strings
    `#&GoogleCloudPlatform#8203;160 <https://github.com/joke2k/django-environ/issues/160>`\_.
-   Added Elasticsearch5 to search scheme
    `#&GoogleCloudPlatform#8203;297 <https://github.com/joke2k/django-environ/pull/297>`\_.
-   Added Elasticsearch7 to search scheme
    `#&GoogleCloudPlatform#8203;314 <https://github.com/joke2k/django-environ/issues/314>`\_.
-   Added the ability to use `bytes` or `str` as a default value for `Env.bytes()`.

Fixed
\+++++

-   Fixed links in the documentation.
-   Use default option in `Env.bytes()`
    `#&GoogleCloudPlatform#8203;206 <https://github.com/joke2k/django-environ/pull/206>`\_.
-   Safely evaluate a string containing an invalid Python literal
    `#&GoogleCloudPlatform#8203;200 <https://github.com/joke2k/django-environ/issues/200>`\_.

Changed
\+++++++

-   Added 'Funding' and 'Say Thanks!' project urls on pypi.
-   Stop raising `UserWarning` if `.env` file isn't found. Log a message with
    `INFO` log level instead `#&GoogleCloudPlatform#8203;243 <https://github.com/joke2k/django-environ/issues/243>`\_.

</details>

---

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appengine/flexible/django_cloudsql/requirements.txt

@@ -1,6 +1,6 @@
 Django==3.2.7
 gunicorn==20.1.0
 psycopg2-binary==2.9.1
-django-environ==0.6.0
+django-environ==0.7.0
 google-cloud-secret-manager==2.7.1
 django-storages[google]==1.11.1

appengine/standard_python3/django/requirements.txt

@@ -1,4 +1,4 @@
 Django==3.2.7
-django-environ==0.6.0
+django-environ==0.7.0
 psycopg2-binary==2.9.1
 google-cloud-secret-manager==2.7.1

run/django/requirements.txt

@@ -1,6 +1,6 @@
 Django==3.2.7
 django-storages[google]==1.11.1
-django-environ==0.6.0
+django-environ==0.7.0
 psycopg2-binary==2.9.1
 gunicorn==20.1.0
 google-cloud-secret-manager==2.7.1