build: Don't require the backports.zoneinfo package for newer python.

We do this so that we can build requirements files that could work to
`pip install` on both the old (3.8) and new (3.11) versions of python.

requirements/constraints.txt

@@ -130,3 +130,6 @@ moto<5.0
 # path==16.12.0 breaks the unit test collections check
 # needs to be investigated and fixed separately
 path<16.12.0
+
+# Temporary to Support the python 3.11 Upgrade
+backports.zoneinfo;python_version<"3.9"  # Newer versions have zoneinfo available in the standard library

requirements/edx/base.txt

@@ -55,7 +55,7 @@ babel==2.14.0
     #   enmerkar-underscore
 backoff==1.10.0
     # via analytics-python
-backports-zoneinfo[tzdata]==0.2.1
+backports-zoneinfo[tzdata]==0.2.1 ; python_version < "3.9"
     # via
     #   -c requirements/edx/../constraints.txt
     #   celery

requirements/edx/development.txt

@@ -111,7 +111,7 @@ backoff==1.10.0
     #   -r requirements/edx/doc.txt
     #   -r requirements/edx/testing.txt
     #   analytics-python
-backports-zoneinfo[tzdata]==0.2.1
+backports-zoneinfo[tzdata]==0.2.1 ; python_version < "3.9"
     # via
     #   -c requirements/edx/../constraints.txt
     #   -r requirements/edx/doc.txt

requirements/edx/doc.txt

@@ -78,7 +78,7 @@ backoff==1.10.0
     # via
     #   -r requirements/edx/base.txt
     #   analytics-python
-backports-zoneinfo[tzdata]==0.2.1
+backports-zoneinfo[tzdata]==0.2.1 ; python_version < "3.9"
     # via
     #   -c requirements/edx/../constraints.txt
     #   -r requirements/edx/base.txt

requirements/edx/testing.txt

@@ -78,7 +78,7 @@ backoff==1.10.0
     # via
     #   -r requirements/edx/base.txt
     #   analytics-python
-backports-zoneinfo[tzdata]==0.2.1
+backports-zoneinfo[tzdata]==0.2.1 ; python_version < "3.9"
     # via
     #   -c requirements/edx/../constraints.txt
     #   -r requirements/edx/base.txt

scripts/user_retirement/requirements/base.txt

@@ -10,8 +10,9 @@ attrs==23.2.0
     # via zeep
 backoff==2.2.1
     # via -r scripts/user_retirement/requirements/base.in
-backports-zoneinfo==0.2.1
+backports-zoneinfo==0.2.1 ; python_version < "3.9"
     # via
+    #   -c scripts/user_retirement/requirements/../../../requirements/constraints.txt
     #   django
     #   pendulum
 boto3==1.34.26

scripts/user_retirement/requirements/testing.txt

@@ -14,7 +14,7 @@ attrs==23.2.0
     #   zeep
 backoff==2.2.1
     # via -r scripts/user_retirement/requirements/base.txt
-backports-zoneinfo==0.2.1
+backports-zoneinfo==0.2.1 ; python_version < "3.9"
     # via
     #   -r scripts/user_retirement/requirements/base.txt
     #   django