Update core template

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

Author: fpistm

STM32/src/templates/package_core_index.json

@@ -14,7 +14,7 @@
             {
               "packager": "STM32",
               "name": "arm-none-eabi-gcc",
-              "version": "8-2018-q4-major"
+              "version": "8.2.1-1.7"
             },
             {
               "packager": "STM32",