python3-sense-hat: Switch to using pillow instead of imaging module

while meta-python does rprovide python3-imaging via python3-pillow, its
better to not rely on that bridge, since this might disappear in future

Signed-off-by: Khem Raj <raj.khem@gmail.com>

recipes-devtools/python/python3-sense-hat_2.2.0.bb

@@ -20,5 +20,5 @@ DEPENDS += " \
 RDEPENDS_${PN} += " \
     ${PYTHON_PN}-numpy \
     ${PYTHON_PN}-rtimu \
-    ${PYTHON_PN}-imaging \
+    ${PYTHON_PN}-pillow \
     "