pr-size-labeler - fetch change info for the maximum number of files

[pavoljuhas]

By default the GHA endpoint pulls/PULL_NUMBER/files retrieves
change data for up to 30 files which is insufficient for PRs that
touch more files. Here we increase the count to the maximum
per_page limit of 100.

It does not seem worthwhile to add pagination processing as
in the last year only 1% of PRs touched more than 100 files.

Ref: https://docs.github.com/en/rest/pulls/pulls?apiVersion=2022-11-28#list-pull-requests-files

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.38%. Comparing base (3e0e213) to head (f6d69e5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7749   +/-   ##
=======================================
  Coverage   99.38%   99.38%           
=======================================
  Files        1090     1090           
  Lines       97920    97920           
=======================================
+ Hits        97314    97315    +1     
+ Misses        606      605    -1     

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[mhucka]

LGTM