Build: Update GCC default version to 10.3

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I5a958ab2b25ad1eb933e833a41c67fbdee552b22
diff --git a/run-cppcheck.sh b/run-cppcheck.sh
index 7526418..1272a26 100755
--- a/run-cppcheck.sh
+++ b/run-cppcheck.sh
@@ -43,7 +43,7 @@
 #Fail if any command exit with error.
 set -e
 
-export PATH=$PATH:$GCC_7_3_1_PATH
+export PATH=$PATH:$GCC_10_3_PATH
 
 RAW_OUTPUT=0