Bump pytest from 6.2.5 to 7.0.0 in /requirements (#18765)

* Bump pytest from 6.2.5 to 7.0.0 in /requirements

Bumps [pytest](https://github.com/pytest-dev/pytest) from 6.2.5 to 7.0.0.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/6.2.5...7.0.0)

---
updated-dependencies:
- dependency-name: pytest
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* Also include tomli in tests.txt

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Mathieu Pillard <mpillard@mozilla.com>

requirements/tests.txt

@@ -45,9 +45,9 @@ py==1.11.0 \
     --hash=sha256:607c53218732647dff4acdfcd50cb62615cedf612e72d1724fb1a0cc6405b378 \
     --hash=sha256:51c75c4126074b472f746a24399ad32f6053d1b34b68d2fa41e558e6f4a98719
 # pytest is required by amo-validator, pytest-base-url, pytest-cov, pytest-django, pytest-html, pytest-instafail, pytest-variables, pytest-xdist
-pytest==6.2.5 \
-    --hash=sha256:7310f8d27bc79ced999e760ca304d69f6ba6c6649c0b60fb0e04a4a77cacc134 \
-    --hash=sha256:131b36680866a76e6781d13f101efb86cf674ebb9762eb70d3082b6f29889e89
+pytest==7.0.0 \
+    --hash=sha256:42901e6bd4bd4a0e533358a86e848427a49005a3256f657c5c8f8dd35ef137a9 \
+    --hash=sha256:dad48ffda394e5ad9aa3b7d7ddf339ed502e5e365b1350e0af65f4a602344b11
 pytest-django==4.5.2 \
     --hash=sha256:c60834861933773109334fe5a53e83d1ef4828f2203a1d6a0fa9972f4f75ab3e \
     --hash=sha256:d9076f759bb7c36939dbdd5ae6633c18edfc2902d1a69fdbefd2426b970ce6c2
@@ -184,3 +184,6 @@ lxml==4.7.1 \
     --hash=sha256:8e54945dd2eeb50925500957c7c579df3cd07c29db7810b83cf30495d79af267 \
     --hash=sha256:447d5009d6b5447b2f237395d0018901dcc673f7d9f82ba26c1b9f9c3b444b60 \
     --hash=sha256:a1613838aa6b89af4ba10a0f3a972836128801ed008078f8c1244e65958f1b24
+tomli==2.0.1 \
+    --hash=sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc \
+    --hash=sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f