chore: Fix version tag sorting in Makefile

[p-offtermatt]

The previous way of sorting tags didn't work; this was the result when I tried locally for me:

git tag --sort=taggerdate               
v0.50.0
v0.50.1
v0.50.10
v0.50.2
v0.50.2-alpha.1
v0.50.3
v0.50.4
v0.50.5
v0.50.6
v0.50.7
v0.50.8
v0.50.9

This means make install would install v0.50.9.
Here is the order with the version:refname sorting:

git tag --sort=version:refname          
v0.50.0
v0.50.1
v0.50.2
v0.50.2-alpha.1
v0.50.3
v0.50.4
v0.50.5
v0.50.6
v0.50.7
v0.50.8
v0.50.9
v0.50.10