Bump waitress from 1.3.1 to 1.4.0

Bumps [waitress](https://github.com/Pylons/waitress) from 1.3.1 to 1.4.0.
- [Release notes](https://github.com/Pylons/waitress/releases)
- [Changelog](https://github.com/Pylons/waitress/blob/master/CHANGES.txt)
- [Commits](https://github.com/Pylons/waitress/compare/v1.3.1...v1.4.0

)

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

Pipfile.lock

@@ -252,9 +252,9 @@
         },
         "sqlalchemy": {
             "hashes": [
-                "sha256:afa5541e9dea8ad0014251bc9d56171ca3d8b130c9627c6cb3681cff30be3f8a"
+                "sha256:bfb8f464a5000b567ac1d350b9090cf081180ec1ab4aa87e7bca12dab25320ec"
             ],
-            "version": "==1.3.11"
+            "version": "==1.3.12"
         },
         "urllib3": {
             "hashes": [
@@ -372,10 +372,11 @@
         },
         "waitress": {
             "hashes": [
-                "sha256:278e09d6849acc1365404bbf7d790d0423b159802e850c726e8cd0a126a2dac7",
-                "sha256:f103e557725b17ae3c62f9e6005cdd85103f8b68fa86cf7c764ba7adc38ca5a2"
+                "sha256:b3b6450106b65bfcbefce5940fff23240305db86683cbf4e524af199b514ba61",
+                "sha256:edbb927a6f7c43d4fde35740786a30c180c1623d70a7ad5fd1d1f4adacc54468"
             ],
-            "version": "==1.3.1"
+            "index": "pypi",
+            "version": "==1.4.0"
         },
         "webob": {
             "hashes": [