Replace some emojis as they are dieplayed badly on some terminals

[nalepae]

No description provided.

[codecov]

Codecov Report

Merging #85 (9f04b25) into main (7f3e774) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main       #85   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           17        17           
  Lines          964       964           
=========================================
  Hits           964       964           

Files	Coverage Δ
eth_validator_watcher/missed_attestations.py	100.00% <ø> (ø)
eth_validator_watcher/slashed_validators.py	100.00% <ø> (ø)
eth_validator_watcher/suboptimal_attestations.py	100.00% <ø> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more