update typing for copy

[spyinx]

Pull Request check-list

• Do tests and lints pass with this change?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?

Description of change

destination_db param in copy() method supports integer, so we can change the type constraint for it
fix: #138

[mkmkme]

Could you please address the DCO check? https://github.com/valkey-io/valkey-py/pull/139/checks?check_run_id=33966562917

[spyinx]

Could you please address the DCO check? https://github.com/valkey-io/valkey-py/pull/139/checks?check_run_id=33966562917

sorry, i'm not familiar with the process here，since someone is working on fixing type hints (see #138) and you think it's useless, you can close this pr, thank you !

[mkmkme]

I don't think this is useless, and we welcome all the good contributions and new contributors :)

Your second commit contains the needed Signed-off-by line, but the first one still doesn't. If you visit this link it will show you the commands needed to fix it.

[mkmkme]

LGTM, thanks!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.19%. Comparing base (1eec818) to head (8af8b4a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #139   +/-   ##
=======================================
  Coverage   76.19%   76.19%           
=======================================
  Files         130      130           
  Lines       33907    33907           
=======================================
  Hits        25837    25837           
  Misses       8070     8070           

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