Fix deprecated rand.Seed

[stefanhaller]

• PR Description

Fix a linter warning that I get locally. No idea why it doesn't also show up on CI.

SA1019: rand.Seed has been deprecated since Go 1.20 and an alternative has been
available since Go 1.0: Programs that call Seed and then expect a specific
sequence of results from the global random source (using functions such as Int)
can be broken when a dependency changes how much it consumes from the global
random source. To avoid such breakages, programs that need a specific result
sequence should use NewRand(NewSource(seed)) to obtain a random generator that
other packages cannot access. (staticcheck)

[github-actions]

Uffizzi Preview deployment-19434 was deleted.

[jesseduffield]

Nice one