Compiling LESS with dvh adds an space to CSS causing invalid property value

[nullending]

Describe the bug
When using the dvh property in LESS, after compiling to CSS it inserts a space between the number and the unit causing invalid CSS.

To Reproduce
With the follow LESS:

.test-class {
    max-height: 70dvh;
    overflow-y: hidden;
}

Compiles to this CSS which is invalid:

.test-class {
  max-height: 70 dvh;
  overflow-y: hidden;
}

Web browsers do not like the space between '70' and 'dvh'.

A workaround is to use an escape value such as:

.test-class {
    max-height: ~"70dvh";
    overflow-y: hidden;
}

[trullock]

this should be a straightforward fix, i bet dvh isnt a recognised unit

PRs welcome