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-alembic_1.13.1.bb

@@ -9,11 +9,11 @@ SRC_URI[sha256sum] = "4932c8558bf68f2ee92b9bbcb8218671c627064d5b08939437af6d77dc
 PYPI_PACKAGE = "alembic"
 
 RDEPENDS:${PN} += "\
-    ${PYTHON_PN}-dateutil \
-    ${PYTHON_PN}-editor \
-    ${PYTHON_PN}-mako \
-    ${PYTHON_PN}-sqlalchemy \
-    ${PYTHON_PN}-misc \
+    python3-dateutil \
+    python3-editor \
+    python3-mako \
+    python3-sqlalchemy \
+    python3-misc \
 "
 
 BBCLASSEXTEND = "native nativesdk"