fix: Fix bash script output in verify-geth-endpoint.sh

[VolodymyrBg]

Description

This pull request fixes a potential issue in the verify-geth-endpoint.sh script by adding double quotes around the arithmetic expansion when outputting the block number. This change follows bash scripting best practices and prevents potential issues when handling special characters or spaces in variable values.
The specific change is in the get_current_block() function, where:
echo $((16#$trimmed_hex))
was changed to:
echo "$((16#$trimmed_hex))"

Tests

The script functionality remains unchanged, but is now more robust. The script was manually tested to ensure it continues to work as expected with the added quotes.

Additional context

This is a minor fix that follows shell scripting best practices. While the specific issue might not manifest in this particular case (as arithmetic expansions typically don't contain spaces), it's good practice to quote variable expansions in bash to prevent word splitting and globbing.

Metadata

Fixes #N/A (No specific issue was referenced for this change)