BLD: Bump Cython version from 0.23 to 0.24

[jschendel]

• closes BLD: Bump Cython version from 0.23 to 0.24 #18613
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

For the whatsnew:

• Used the same whatsnew message as was used during the last cython version bump in 0.20
• Moved some previous entries that were under the main "Backwards incompatible API changes" section to the "Other API Changes" subsection.

[codecov]

Codecov Report

Merging #18623 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #18623      +/-   ##
==========================================
- Coverage   91.46%   91.45%   -0.02%     
==========================================
  Files         157      157              
  Lines       51449    51449              
==========================================
- Hits        47060    47051       -9     
- Misses       4389     4398       +9

Flag	Coverage Δ
#multiple	89.32% <ø> (ø)	⬆️
#single	40.6% <ø> (-0.11%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/core/frame.py	97.81% <0%> (-0.1%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6e56195...97cc75f. Read the comment docs.

[codecov]

Codecov Report

Merging #18623 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #18623      +/-   ##
==========================================
- Coverage   91.46%   91.45%   -0.02%     
==========================================
  Files         157      157              
  Lines       51449    51449              
==========================================
- Hits        47060    47051       -9     
- Misses       4389     4398       +9

Flag	Coverage Δ
#multiple	89.32% <ø> (ø)	⬆️
#single	40.6% <ø> (-0.11%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/core/frame.py	97.81% <0%> (-0.1%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6e56195...97cc75f. Read the comment docs.

[codecov]

Codecov Report

Merging #18623 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #18623      +/-   ##
==========================================
- Coverage   91.59%   91.58%   -0.02%     
==========================================
  Files         155      155              
  Lines       51255    51255              
==========================================
- Hits        46949    46941       -8     
- Misses       4306     4314       +8

Flag	Coverage Δ
#multiple	89.44% <ø> (ø)	⬆️
#single	40.67% <ø> (-0.11%)	⬇️

Impacted Files	Coverage Δ
pandas/io/gbq.py	25% <0%> (-58.34%)	⬇️
pandas/core/frame.py	97.81% <0%> (-0.1%)	⬇️
pandas/core/indexes/datetimes.py	95.68% <0%> (+0.09%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2c903d5...d7fd50c. Read the comment docs.

[jorisvandenbossche]

I don't think we should necessarily be mentioned that prominent (in the table), as it is only a development dependency, not a user dependency

[jreback]

agree, this just needs a mention in api breaking, not a sub-section

[jschendel]

done

[jreback]

agree, this just needs a mention in api breaking, not a sub-section

[jreback]

lgtm. ping on green.

[jschendel]

ping @jreback : green

[jorisvandenbossche]

@jschendel thanks!