Align starlette to 0.28.0 in all subpackages

[albertvillanova]

This PR aligns the starlette version to 0.28.0 in all subpackages.

Note that before this PR:

• in the admin and worker services, starlette was pinned to 0.27.0
• whereas in the libapi, starlette was pinned to 0.28.0

Thus, the admin and worker services could not use the libapi (subsequent PR).

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (41ea211) 95.56% compared to head (4c1c87e) 89.25%.
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1945      +/-   ##
==========================================
- Coverage   95.56%   89.25%   -6.32%     
==========================================
  Files          14      154     +140     
  Lines         519     8755    +8236     
==========================================
+ Hits          496     7814    +7318     
- Misses         23      941     +918     

Flag	Coverage Δ
jobs_cache_maintenance	95.56% <ø> (ø)
jobs_mongodb_migration	86.32% <ø> (?)
libs_libcommon	92.08% <ø> (?)
services_admin	85.59% <ø> (?)
services_api	86.79% <ø> (?)
services_rows	84.06% <ø> (?)
services_search	77.46% <50.00%> (?)
services_sse-api	94.16% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
services/search/tests/routes/test_filter.py	100.00% <100.00%> (ø)
services/search/src/search/routes/filter.py	46.06% <0.00%> (ø)

... and 138 files with indirect coverage changes

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