Apply updates from cookiecutter

This automated commit applies the latest updates from our cookiecutters [1] to
this repo.

[1]: https://github.com/hypothesis/cookiecutters

.gitignore

@@ -1,4 +1,4 @@
-build
+/build
 coverage
 node_modules
 yarn-error.log
@@ -11,3 +11,4 @@ supervisord.pid
 .DS_Store
 .devdata*
 .eslintcache
+*.tsbuildinfo

pyproject.toml

@@ -14,6 +14,7 @@ filterwarnings = [
     "ignore:^pkg_resources is deprecated as an API:DeprecationWarning:pyramid",
     "ignore:^Deprecated call to .pkg_resources\\.declare_namespace\\('.*'\\).\\.:DeprecationWarning:pkg_resources",
     "ignore:^'cgi' is deprecated and slated for removal in Python 3\\.13$:DeprecationWarning:webob",
+    "ignore:^datetime\\.datetime\\.utcnow\\(\\) is deprecated and scheduled for removal in a future version\\.:DeprecationWarning",
 ]
 
 [tool.pydocstyle]