test: silence no-restricted-syntax in source-map assert fixtures

The literal first argument to assert() is intentional in these
regression fixtures (the .snapshot files pin the exact source line and
column), so disable the rule inline rather than rewriting the call.

Author: kimjune01

test/fixtures/source-map/output/source_map_assert_no_source_map.mjs

@@ -6,4 +6,4 @@ import { strict as assert } from 'node:assert';
 // Regression test for https://github.com/nodejs/node/issues/63169
 // Under --enable-source-maps with no source map for this file, a failing
 // assert(value) must throw AssertionError, not TypeError ERR_INVALID_ARG_TYPE.
-assert(false);
+assert(false); // eslint-disable-line no-restricted-syntax

test/fixtures/source-map/output/source_map_assert_ok_no_source_map.cjs

@@ -7,4 +7,4 @@ const assert = require('node:assert');
 // Regression test for https://github.com/nodejs/node/issues/63169
 // Under --enable-source-maps with no source map for this file, a failing
 // assert.ok(value) must throw AssertionError, not TypeError ERR_INVALID_ARG_TYPE.
-assert.ok(false);
+assert.ok(false); // eslint-disable-line no-restricted-syntax