refactor: the type of GetEventsRequest.start_ledger has changed from str to int.

[overcat]

No description provided.

[overcat]

#845

[codecov]

Codecov Report

Merging #847 (cdbb6d6) into main (a44fb38) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #847   +/-   ##
=======================================
  Coverage   98.63%   98.63%           
=======================================
  Files         253      253           
  Lines       13239    13239           
=======================================
  Hits        13058    13058           
  Misses        181      181           

Flag	Coverage Δ
unittests	98.63% <100.00%> (ø)

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Files	Coverage Δ
stellar_sdk/soroban_rpc.py	100.00% <100.00%> (ø)
tests/test_soroban_server_async.py	100.00% <ø> (ø)
tests/test_soroban_server_sync.py	100.00% <ø> (ø)