common: Rename Merge hardfork to Paris

[g11tech]

Closes #2360

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (develop-v7@0eda3e7). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

Flag	Coverage Δ
block	90.44% <0.00%> (?)
blockchain	90.43% <0.00%> (?)
client	87.02% <0.00%> (?)
common	95.76% <0.00%> (?)
devp2p	91.80% <0.00%> (?)
ethash	∅ <0.00%> (?)
evm	79.35% <0.00%> (?)
statemanager	88.08% <0.00%> (?)
trie	90.39% <0.00%> (?)
tx	95.45% <0.00%> (?)
util	81.50% <0.00%> (?)
vm	84.39% <0.00%> (?)

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[holgerd77]

Ok, this seems to have been impressively smooth! 🙏 🥳

Cool, will aprove and merge.