docs: replace "http://sentry.io" with "https://sentry.io"

[nilsreichardt]

📜 Description

We should use "https" instead of "http". Or was there any reason why http has been used?
#skip-changelog

💡 Motivation and Context

💚 How did you test it?

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

[marandaneto]

Thanks @nilsreichardt

[codecov-commenter]

Codecov Report

Base: 91.37% // Head: 91.37% // No change to project coverage 👍

Coverage data is based on head (be893c1) compared to base (56810ff).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1073   +/-   ##
=======================================
  Coverage   91.37%   91.37%           
=======================================
  Files           9        9           
  Lines         197      197           
=======================================
  Hits          180      180           
  Misses         17       17           

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[marandaneto]

@vaind maybe we need a condition within the metrics job to not run when people don't have enough access (community PRs).

ERROR [2022-10-12 06:50:51.10]: Error cloning certificates git repo, please make sure you have access to the repository - see instructions above
INFO [2022-10-12 06:50:51.11]: Successfully generated documentation at path '/Users/runner/work/sentry-dart/sentry-dart/metrics/fastlane/README.md'

Similar to https://github.com/getsentry/sentry-android-gradle-plugin/blob/d59d745982b88649e2b89c5311a9f1a9c82dc15e/.github/workflows/test-publish.yaml#L36