fix: replace rand.seed method to support golang 1.20

[pbr0ck3r]

What this PR does / why we need it

• Replace rand.seed(1) method to be rand.New(rand.NewSource(1)) in order to allow sqlboiler to generate code compatible with Golang 1.20. Ensured methods exist in Golang 1.16, https://pkg.go.dev/math/rand@go1.16

staticcheck error:

 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.  (SA1019)