jammy-amd64-tf-a-build: update Python 3 requirements

A recent change in Alabaster requires a later version of Sphinx. This
change updates all of the Python packages that are present in the TF-A
Poetry lockfile with their locked versions.

Change-Id: I74cdbb43957f41e00ca1c13d5c9ac46e4afcb120
Signed-off-by: Chris Kay <chris.kay@arm.com>
diff --git a/jammy-amd64-tf-a-build/requirements_python3.txt b/jammy-amd64-tf-a-build/requirements_python3.txt
index 571caca..4ab4f0e 100644
--- a/jammy-amd64-tf-a-build/requirements_python3.txt
+++ b/jammy-amd64-tf-a-build/requirements_python3.txt
@@ -1,6 +1,6 @@
-MarkupSafe==1.1.0
+MarkupSafe==2.1.2
 PyYAML==6.0
-Sphinx==2.0.1
+Sphinx==5.3.0
 cbor==1.0.0
 configobj==5.0.6
 cryptography==2.7
@@ -11,7 +11,7 @@
 poetry==1.3.2
 pyasn1==0.1.9
 pycryptodome==3.6.6
-sphinx-rtd-theme==0.4.3
-sphinxcontrib-plantuml==0.15
+sphinx-rtd-theme==1.2.0
+sphinxcontrib-plantuml==0.24.1
 tuxsuite==1.37.1
 xmltodict==0.12.0