fix(bench): remove unnecessary shell: true from execFileSync (#168)

execFileSync already receives args as an array, so shell: true is
redundant and a minor security anti-pattern. Addresses Greptile review.

Impact: 1 functions changed, 0 affected

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: carlos-alm

scripts/lib/bench-config.js

@@ -70,7 +70,6 @@ export async function resolveBenchmarkSource() {
 				cwd: tmpDir,
 				stdio: 'pipe',
 				timeout: 120_000,
-				shell: true,
 			});
 			break;
 		} catch (err) {