[CI] Update config for BlackPill F303CC

Skip sketches which require USER_BTN.

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>

Author: fpistm

CI/build/conf/cores_config.json

@@ -46,6 +46,7 @@
             "BLUEPILL_F103C6",
             "BLUEPILL_F103C8",
             "BLUEPILL_F103C8B",
+            "BLACKPILL_F303CC",
             "DIYMROE_F407VGT",
             "EEXTR_F030_V1",
             "HY_TinySTM103TB",
@@ -99,6 +100,7 @@
           "applicable": true,
           "boards": [
             "BLUEPILL_F103C8",
+            "BLACKPILL_F303CC",
             "BLACK_F407VE",
             "MAPLEMINI_F103CB",
             "NUCLEO_F207ZG",
@@ -124,6 +126,7 @@
             "BLUEPILL_F103C6",
             "BLUEPILL_F103C8",
             "BLUEPILL_F103C8B",
+            "BLACKPILL_F303CC",
             "BLUE_F407VE_Mini",
             "DIYMROE_F407VGT",
             "EEXTR_F030_V1",