fix(ci): use lax checksums in MAVEN_ARGS for snapshot workflow
Maven's CLI parses -C and -c with if/else-if, so -C always wins when
both are present. The previous fix appended -c to the deploy command
but it was silently ignored because -C was already in MAVEN_ARGS.
Move -c into MAVEN_ARGS directly, replacing -C, so lax checksums apply
to the entire snapshot build including the deploy phase.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>