[deps] Bump Werkzeug to 3.1.3

This resolves several Dependabot alerts. Move the pinning down to
requirements.server.text.

Supersedes #26

Author: ldionne

requirements.server.txt

@@ -5,3 +5,4 @@ gunicorn==19.9.0
 Jinja2==3.1.6
 progressbar2
 pyyaml==6.0
+Werkzeug==3.1.3

setup.py

@@ -122,7 +122,6 @@
         "Jinja2",
         "MarkupSafe==1.1.1",
         "SQLAlchemy==1.3.24",
-        "Werkzeug==0.15.6",
         "itsdangerous==0.24",
         "python-gnupg==0.3.7",
         "pytz==2016.10",
@@ -133,6 +132,7 @@
         "click==6.7",
         "requests",
         "certifi"
+        "Werkzeug",
     ],
 
     ext_modules=[cPerf],