chore: fix event being empty for latest block

[BaoHG1508]

Description of change

Instead of passing the block number, using the block hash seems to solve the issue where we receive "empty" events list even though there's events and that's why we have to retry when received empty events list. Since we only need to fetch the latest block’s events, we don’t need ranged fetches using the block hash works fine.

Type of change (delete irrelevant types)

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have tested locally and linked a screen recording with this PR
• I have adhered to clean code conventions
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have added tests that prove my fix is effective or that my feature works

[metalboyrick]

lgtm