build(deps): bump flake8 from 6.1.0 to 7.0.0 in /tools/base

Bumps [flake8](https://github.com/pycqa/flake8) from 6.1.0 to 7.0.0.
- [Commits](PyCQA/flake8@6.1.0...7.0.0)

---
updated-dependencies:
- dependency-name: flake8
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

tools/base/requirements.txt

@@ -535,9 +535,9 @@ fasteners==0.19 \
     # via
     #   google-apitools
     #   gsutil
-flake8==6.1.0 \
-    --hash=sha256:d5b3857f07c030bdb5bf41c7f53799571d75c4491748a3adcd47de929e34cd23 \
-    --hash=sha256:ffdfce58ea94c6580c77888a86506937f9a1a227dfcd15f245d694ae20a6b6e5
+flake8==7.0.0 \
+    --hash=sha256:33f96621059e65eec474169085dc92bf26e7b2d47366b70be2f67ab80dc25132 \
+    --hash=sha256:a6dfbb75e03252917f2473ea9653f7cd799c3064e54d4c8140044c5c065f53c3
     # via
     #   -r requirements.in
     #   envoy-code-check
@@ -1002,9 +1002,9 @@ pycparser==2.21 \
     --hash=sha256:8ee45429555515e1f6b185e78100aea234072576aa43ab53aefcae078162fca9 \
     --hash=sha256:e644fdec12f7872f86c58ff790da456218b10f863970249516d60a5eaca77206
     # via cffi
-pyflakes==3.1.0 \
-    --hash=sha256:4132f6d49cb4dae6819e5379898f2b8cce3c5f23994194c24b77d5da2e36f774 \
-    --hash=sha256:a0aae034c444db0071aa077972ba4768d40c830d9539fd45bf4cd3f8f6992efc
+pyflakes==3.2.0 \
+    --hash=sha256:1c61603ff154621fb2a9172037d84dca3500def8c8b630657d1701f026f8af3f \
+    --hash=sha256:84b5be138a2dfbb40689ca07e2152deb896a65c3a3e24c251c5c62489568074a
     # via flake8
 pygithub==2.1.1 \
     --hash=sha256:4b528d5d6f35e991ea5fd3f942f58748f24938805cb7fcf24486546637917337 \