Bump certifi from 2023.5.7 to 2023.7.22

There is a securiy vulnerability for certifi versions <2023.7.22 (see
details here: https://nvd.nist.gov/vuln/detail/CVE-2023-37920). Even
though this version is only in /examples, it gets detected and flagged
by static analysis tools when scanning docker images that have the
latest version of pipenv installed.

examples/Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "8d14434df45e0ef884d6c3f6e8048ba72335637a8631cc44792f52fd20b6f97a"
+            "sha256": "6a44fe37aaf35b2b653e3e4ff422efc6370108bf8a09a43858dfef57f7cd41a8"
         },
         "pipfile-spec": 6,
         "requires": {},
@@ -16,11 +16,12 @@
     "default": {
         "certifi": {
             "hashes": [
-                "sha256:0f0d56dc5a6ad56fd4ba36484d6cc34451e1c6548c61daad8c320169f91eddc7",
-                "sha256:c6c2e98f5c7869efca1f8916fed228dd91539f9f1b444c314c06eef02980c716"
+                "sha256:539cc1d13202e33ca466e88b2807e29f4c13049d6d87031a3c110744495cb082",
+                "sha256:92d6037539857d8206b8f6ae472e8b77db8058fec5937a1ef3f54304089edbb9"
             ],
+            "index": "pypi",
             "markers": "python_version >= '3.6'",
-            "version": "==2023.5.7"
+            "version": "==2023.7.22"
         },
         "charset-normalizer": {
             "hashes": [