chore(deps): update dependency google-cloud-datastore to v1.15.4 (GoogleCloudPlatform#7749)

Co-authored-by: Leah E. Cole <[email protected]>

Author: renovate-bot

appengine/standard/migration/taskqueue/counter/requirements.txt

@@ -1,6 +1,6 @@
 Flask==1.1.4; python_version < '3.0'
 Flask==2.1.0; python_version > '3.0'
 google-cloud-datastore==2.4.0; python_version >= "3.0"
-google-cloud-datastore==1.15.3; python_version < "3.0"
+google-cloud-datastore==1.15.4; python_version < "3.0"
 google-cloud-tasks==2.7.1 ; python_version >= "3.0"
 google-cloud-tasks==1.5.1 ; python_version < "3.0"

appengine/standard/migration/taskqueue/pull-counter/requirements.txt

@@ -1,7 +1,7 @@
 Flask==1.1.4; python_version < '3.0'
 Flask==2.1.0; python_version > '3.0'
 google-cloud-datastore==2.4.0 ; python_version >= "3.0"
-google-cloud-datastore==1.15.3 ; python_version < "3.0"
+google-cloud-datastore==1.15.4 ; python_version < "3.0"
 google-cloud-pubsub==2.9.0 ; python_version >= "3.0"
 # 1.7.0 is the latest compatible version for Python 2.
 google-cloud-pubsub==1.7.1 ; python_version < "3.0"