chore: update requirements.txt to address dependabot security alerts.…

… (#1957)

Source-Link: googleapis/synthtool@e451548
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-java:latest@sha256:d13de1a4faec2645bda630b7a9aa080ce95182795aeab6f37ed4bd18cf5facbc

.github/.OwlBot.lock.yaml

@@ -1,4 +1,4 @@
-# Copyright 2023 Google LLC
+# Copyright 2024 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -13,4 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-java:latest
-  digest: sha256:ad9cabee4c022f1aab04a71332369e0c23841062124818a4490f73337f790337
+  digest: sha256:d13de1a4faec2645bda630b7a9aa080ce95182795aeab6f37ed4bd18cf5facbc
+# created: 2024-04-24T14:22:15.892514394Z