`inspect.{getsourcelines, findsource}` return 0 as the starting line number for modules

[artemmukhin]

Bug report

Run the following program

import inspect
import inspect
_, lineno1 = inspect.getsourcelines(inspect.currentframe())
_, lineno2 = inspect.findsource(inspect.currentframe())
print(lineno1, lineno2)

Expected Result
The line numbers are expected to be 1-based, so the expected output is 1 1.

Actual Result
The actual output is 0 0.

Related discussion: #103226

Your environment

• CPython versions tested on: main branch
• Operating system and architecture: macOS

Linked PRs

• GH-103319: Fix inspect.getsourcelines() to return 1-based line numbers #103226