meta-python: drop ${PYTHON_PN}

python 2 is long unsupported, so we no longer need this variable.

Signed-off-by: Tim Orling <tim.orling@konsulko.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-python/recipes-devtools/python/python3-flask-babel_4.0.0.bb

@@ -9,7 +9,7 @@ PYPI_PACKAGE = "flask_babel"
 inherit pypi python_poetry_core
 
 RDEPENDS:${PN} += "\
-    ${PYTHON_PN}-speaklater \
-    ${PYTHON_PN}-babel \
-    ${PYTHON_PN}-flask \
+    python3-speaklater \
+    python3-babel \
+    python3-flask \
     "