refactor: replace sort.Strings with slices.Sort (#23457)

The slices package provides type-safe generic replacements for the
old typed sort convenience functions. The codebase already uses
slices.Sort in 43 call sites; this finishes the migration for the
remaining 29.

- sort.Strings(x)          -> slices.Sort(x)
- sort.Float64s(x)         -> slices.Sort(x)
- sort.StringsAreSorted(x) -> slices.IsSorted(x)

coderd/database/dbauthz/setup_test.go

@@ -6,7 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"reflect"
-	"sort"
+	"slices"
 	"strings"
 	"testing"
 
@@ -97,7 +97,7 @@ func (s *MethodTestSuite) TearDownSuite() {
 				notCalled = append(notCalled, m)
 			}
 		}
-		sort.Strings(notCalled)
+		slices.Sort(notCalled)
 		for _, m := range notCalled {
 			t.Errorf("Method never called: %q", m)
 		}