refactor: redundant lex in lex_less

[anqur]

There's a redundant accept found in lex_less while lexing <--> or <-- related operators.

[c42f]

Heya, we just moved JuliaSyntax into Base in JuliaLang/julia#59870 - if you want to re-propose this PR over there, I've created a branch https://github.com/JuliaLang/JuliaSyntax.jl/tree/pr-for-Base/585 to make this easier.

To make use of the branch, you can use the following steps:

• Clone JuliaLang/julia
• Add JuliaSyntax as a git remote
• Check out pr-for-Base/585
• Rebase on top of master

For example:

# git clone git@github.com:JuliaLang/julia julia_dir
# cd julia_dir

git remote add JuliaSyntax git@github.com:JuliaLang/JuliaSyntax.jl
git fetch JuliaSyntax
git checkout pr-for-Base/585
git rebase origin/master

Sorry this wasn't dealt with prior to the big move!