Update main.yml

Author: mcbarton

.github/workflows/main.yml

@@ -143,7 +143,7 @@ jobs:
               valgrind --show-error-list=yes --track-origins=yes --error-exitcode=1 \
                 --show-leak-kinds=definite,possible \
                 --gen-suppressions=all \
-                --suppressions="xeus-cpp-valgrind_x86.supp" \
+                --suppressions="etc/xeus-cpp-valgrind_x86.supp" \
                 test/test_xeus_cpp
           fi