profile._f_lineno: handle next_line being None in Python 3.13

[AdamWill]

In Python 3.13, it's possible for dis.findlinestarts to return a line number as None. We don't ever want to return None as the line number, so guard against this.

• Tests added / passed
• Passes pre-commit run --all-files

[GPUtester]

Can one of the admins verify this patch?

Admins can comment ok to test to allow this one PR to run or add to allowlist to allow all future PRs from the same author to run.

[github-actions]

Unit Test Results

See test report for an extended history of previous test failures. This is useful for diagnosing flaky tests.

    29 files  ±    0      29 suites  ±0   11h 28m 49s ⏱️ + 1h 23m 23s
 4 061 tests  -     5   3 960 ✅ +   13     97 💤  -   9  4 ❌  - 5 
55 939 runs  +7 597  53 770 ✅ +7 372  2 163 💤 +247  6 ❌  - 5 

For more details on these failures, see this check.

Results for commit a47265f. ± Comparison against base commit aeebb2d.

This pull request removes 13 and adds 8 tests. Note that renamed tests count towards both.

distributed.protocol.tests.test_arrow
distributed.protocol.tests.test_collection
distributed.protocol.tests.test_highlevelgraph
distributed.protocol.tests.test_numpy
distributed.protocol.tests.test_pandas
distributed.shuffle.tests.test_graph
distributed.shuffle.tests.test_merge
distributed.shuffle.tests.test_merge_column_and_index
distributed.shuffle.tests.test_metrics
distributed.shuffle.tests.test_rechunk
…

distributed.diagnostics.tests.test_memray ‑ test_basic_integration_scheduler
distributed.diagnostics.tests.test_memray ‑ test_basic_integration_scheduler_report_args[False]
distributed.diagnostics.tests.test_memray ‑ test_basic_integration_scheduler_report_args[report_args0]
distributed.diagnostics.tests.test_memray ‑ test_basic_integration_workers[1]
distributed.diagnostics.tests.test_memray ‑ test_basic_integration_workers[False]
distributed.diagnostics.tests.test_memray ‑ test_basic_integration_workers[True]
distributed.diagnostics.tests.test_memray ‑ test_basic_integration_workers_report_args[False]
distributed.diagnostics.tests.test_memray ‑ test_basic_integration_workers_report_args[report_args0]

[fjetter]

Thank you for fixing all those small issues! If there is something we can help you with, let us know