[HttpKernel] fix DumpDataCollectorTest after CS changes

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

Modify the expected line value which was affected by the move of the
`__LINE__` constant in #12872 to make tests pass again.