Release 1.6.0 (Manual)

[spacesailor24]

Therelease/1.6.0 branch was made from the release/1.5.3 branch to avoid including any changes that had been merged since then and are scheduled to be release now as 1.6.1 (#4391). This resulted in a bunch of merge conflicts and I'm not sure the best way to handle the situation, so I opted to create this PR that does everything #4391 is supposed to do (bump the version numbers and update dist/) manually, with the end result being as if we had released 1.6.0 before merging any of the changes schedule for 1.6.1

[render]

Your Render PR Server URL is https://web3-js-pr-4407.onrender.com.

Follow its progress at https://dashboard.render.com/static/srv-c5aitb1g7hp6o9nalot0.

[coveralls]

Pull Request Test Coverage Report for Build 1289485817

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 72.545%

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Totals
Change from base Build 1285611257:	0.0%
Covered Lines:	3355
Relevant Lines:	4367

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💛 - Coveralls

[jdevcs]

one observation, seems release/1.6.0 was branched from the release/1.5.3 instead of release/1.5.2?