Add HypersSpy to ecosystem.rst

[jlaehne]

Add HyperSpy to array section of the ecosystem listing.

• [n/a ] Closes #xxxx
• [n/a] Tests added / passed
• Passes pre-commit run --all-files
• Renders correctly at https://dask--11008.org.readthedocs.build/en/11008/ecosystem.html

[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.

     15 files  ±0       15 suites  ±0   3h 23m 6s ⏱️ + 4m 1s
 13 105 tests ±0   12 159 ✅ ±0     930 💤 ±0  16 ❌ ±0 
162 239 runs  ±0  142 080 ✅ ±0  20 143 💤 ±0  16 ❌ ±0 

For more details on these failures, see this check.

Results for commit 5fcfd6a. ± Comparison against base commit f9310c4.

[phofl]

thx