MAINT: in1d -> isin

[tylerjereddy]

• replace deprecated in1d with isin calls per API: Cleaning numpy/__init__.py and main namespace - Part 4 [NEP 52] numpy/numpy#24445, as part of effort to remain NumPy 2.0 compliant

• the testsuite seems happy locally--if there are any cases where in1d was potentially receiving
  arrays with ndim > 1, we may want to add ravel() to the outputs in these replacements just to be safe, but I've assumed the testsuite has us covered

• for now, I've intentionally not adjusted the docstring of our Cython _in2d, which refers
  to in1d; seems less critical for now

---

📚 Documentation preview 📚: https://mdanalysis--4255.org.readthedocs.build/en/4255/

[github-actions]

Linter Bot Results:

Hi @tylerjereddy! Thanks for making this PR. We linted your code and found the following:

Some issues were found with the formatting of your code.

Code Location	Outcome
main package	⚠️ Possible failure
testsuite	✅ Passed

Please have a look at the darker-main-code and darker-test-code steps here for more details: https://github.com/MDAnalysis/mdanalysis/actions/runs/5979957032/job/16225123491

---

Please note: The black linter is purely informational, you can safely ignore these outcomes if there are no flake8 failures!

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01% 🎉

Comparison is base (8923c4a) 93.40% compared to head (13c592c) 93.41%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #4255      +/-   ##
===========================================
+ Coverage    93.40%   93.41%   +0.01%     
===========================================
  Files          169      183      +14     
  Lines        22204    23309    +1105     
  Branches      4064     4064              
===========================================
+ Hits         20740    21775    +1035     
- Misses         948     1018      +70     
  Partials       516      516              

Files Changed	Coverage Δ
...DAnalysis/analysis/hydrogenbonds/hbond_analysis.py	97.22% <ø> (ø)
package/MDAnalysis/analysis/align.py	96.38% <100.00%> (ø)
package/MDAnalysis/core/groups.py	97.51% <100.00%> (ø)
package/MDAnalysis/core/selection.py	98.59% <100.00%> (ø)
package/MDAnalysis/core/topologyattrs.py	96.13% <100.00%> (ø)
package/MDAnalysis/core/topologyobjects.py	98.16% <100.00%> (ø)

... and 14 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[hmacdope]

CHANGELOG, other than that looks great.

[tylerjereddy]

Ok, I added a CHANGELOG entry, hopefully that works.

[orbeckst]

LGTM — failures are codecov and not relevant.

There's one fix to the CHANGELOG but I'll just add the suggestion.

[hmacdope]

Thanks @tylerjereddy