Convert to new override syntax

This is the result of automated script (0.9.1) conversion:

oe-core/scripts/contrib/convert-overrides.py .

converting the metadata to use ":" as the override character instead of "_".

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-python/recipes-devtools/python/python3-pandas_1.3.1.bb

@@ -14,9 +14,9 @@ DEPENDS += " \
     ${PYTHON_PN}-numpy-native ${PYTHON_PN}-cython-native \
 "
 
-CFLAGS_append_toolchain-clang = " -Wno-error=deprecated-declarations"
+CFLAGS:append:toolchain-clang = " -Wno-error=deprecated-declarations"
 
-RDEPENDS_${PN} += " \
+RDEPENDS:${PN} += " \
     ${PYTHON_PN}-json \
     ${PYTHON_PN}-numpy \
     ${PYTHON_PN}-dateutil \