Update deprecated code after moving to Go 1.19

[ckadner]

controllers/servingruntime_validator.go:142:43: SA1019: sets.String is deprecated: use generic Set instead. new ways: s1 := Set[string]{} s2 := New[string]() (staticcheck)
func checkName(name string, internalNames sets.String, logStr string) error {
                                          ^
controllers/modelmesh/model_type_labels.go:26:11: SA1019: sets.String is deprecated: use generic Set instead. new ways: s1 := Set[string]{} s2 := New[string]() (staticcheck)
        mtLabels sets.String, pvLabels sets.String, rtLabel string) {
                 ^
controllers/modelmesh/model_type_labels.go:29:16: SA1019: sets.String is deprecated: use generic Set instead. new ways: s1 := Set[string]{} s2 := New[string]() (staticcheck)
        mtSet := make(sets.String, 2*len(rt.SupportedModelFormats))
                      ^

For the time being, the following deprecation warnings/errors have been supressed:

   # Exclude some deprecation errors
    - linters:
        - staticcheck
      text: "SA1019:"

Originally posted by @ckadner in #379 (comment)