Unpin dependencies that are no longer needed

[jouho]

Problem:

#5534 unblocks several dependencies to be unpinned:

• Unpin dependencies after bumping MSRV beyond 1.64 #5339
• Unpin dependencies after bumping MSRV beyond 1.66 #4786
• Unpin dependencies after bumping MSRV beyond 1.72 #4518
• Unpin dependencies after bumping MSRV to 1.70 #4395
• Unpin dependencies after bumping MSRV beyond 1.65 #4242

Solution:

unpin the listed dependencies and clean up the listed tracking issues