chore(deps): update dependency nox to v2025 (#248)

Author: renovate-bot

packages/google-cloud-testutils/.kokoro/docker/docs/requirements.txt

@@ -20,9 +20,9 @@ filelock==3.16.1 \
     --hash=sha256:2082e5703d51fbf98ea75855d9d5527e33d8ff23099bec374a134febee6946b0 \
     --hash=sha256:c249fbfcd5db47e5e2d6d62198e565475ee65e4831e2561c8e313fa7eb961435
     # via virtualenv
-nox==2024.10.9 \
-    --hash=sha256:1d36f309a0a2a853e9bccb76bbef6bb118ba92fa92674d15604ca99adeb29eab \
-    --hash=sha256:7aa9dc8d1c27e9f45ab046ffd1c3b2c4f7c91755304769df231308849ebded95
+nox==2025.2.9 \
+    --hash=sha256:7d1e92d1918c6980d70aee9cf1c1d19d16faa71c4afe338fffd39e8a460e2067 \
+    --hash=sha256:d50cd4ca568bd7621c2e6cbbc4845b3b7f7697f25d5fb0190ce8f4600be79768
     # via -r synthtool/gcp/templates/python_library/.kokoro/docker/docs/requirements.in
 packaging==24.2 \
     --hash=sha256:09abb1bccd265c01f4a3aa3f7a7db064b36514d2cba19a2f694fe6150451a759 \