Skip big-endian floats in test_serialize_scipy_sparse if using scipy>=1.15.0

[hendrikmakait]

Fixes CI.
Upstream issue: scipy/scipy#22258

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

[github-actions]

Unit Test Results

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

    27 files  ±0      27 suites  ±0   11h 30m 11s ⏱️ - 1m 40s
 4 127 tests ±0   4 000 ✅ +4    126 💤 + 14  1 ❌  -  17 
51 714 runs   - 1  49 272 ✅ +3  2 439 💤 +140  3 ❌  - 143 

For more details on these failures, see this check.

Results for commit 2ff8ded. ± Comparison against base commit 40b7646.

This pull request skips 14 tests.

distributed.protocol.tests.test_scipy ‑ test_serialize_scipy_sparse[dtype1-bsr_matrix]
distributed.protocol.tests.test_scipy ‑ test_serialize_scipy_sparse[dtype1-coo_matrix]
distributed.protocol.tests.test_scipy ‑ test_serialize_scipy_sparse[dtype1-csc_matrix]
distributed.protocol.tests.test_scipy ‑ test_serialize_scipy_sparse[dtype1-csr_matrix]
distributed.protocol.tests.test_scipy ‑ test_serialize_scipy_sparse[dtype1-dia_matrix]
distributed.protocol.tests.test_scipy ‑ test_serialize_scipy_sparse[dtype1-dok_matrix]
distributed.protocol.tests.test_scipy ‑ test_serialize_scipy_sparse[dtype1-lil_matrix]
distributed.protocol.tests.test_scipy ‑ test_serialize_scipy_sparse[dtype3-bsr_matrix]
distributed.protocol.tests.test_scipy ‑ test_serialize_scipy_sparse[dtype3-coo_matrix]
distributed.protocol.tests.test_scipy ‑ test_serialize_scipy_sparse[dtype3-csc_matrix]
…

[phofl]

We might want to remove them altogether depending on the issue, but this seems fine for now