Reentrancy is a common root-cause for exploits in smart contracts.  To avoid the specific case of basic reentrancy, a nonReentrant modifier is often used.  In the case of a handful of functions in VotingEscrow.sol, this modifier is unnecessary, because the cause of reentrancy - calling into external contracts - is also missing.  While they are not a risk, they do cause extra computation, and thus raise gas costs, which may be of some notice especially during high network congestion.
Locations where they exist:
https://github.com/code-423n4/2023-08-verwa/blob/a693b4db05b9e202816346a6f9cada94f28a2698/src/VotingEscrow.sol#L268
https://github.com/code-423n4/2023-08-verwa/blob/a693b4db05b9e202816346a6f9cada94f28a2698/src/VotingEscrow.sol#L288
https://github.com/code-423n4/2023-08-verwa/blob/a693b4db05b9e202816346a6f9cada94f28a2698/src/VotingEscrow.sol#L326C5-L326
https://github.com/code-423n4/2023-08-verwa/blob/a693b4db05b9e202816346a6f9cada94f28a2698/src/VotingEscrow.sol#L356
No identified risk, since no external contract calls are made in these functions. However there is the cost of computation from running the modifiers during each call, thus increasing gas costs.
Remove the modifiers from the function definitions.
