build: fixed 7 char version hash
build: fixed 7 char version hash

Newer versions of git return 10 chars, while older return 7.
Hardcoded the cound to 7 to ensure compatability between agents.

mbeddr/mbeddr.core,mbeddr/mbeddr.core,mbeddr/mbeddr.core,mbeddr/mbeddr.core,mbeddr/mbeddr.core