Deprecate integer min/max functions

Go 1.21 provides min/max builtins. New code going into other
Kubernetes repositories (requiring Go 1.21 or later) should use those
instead.

Signed-off-by: Stephen Kitt <skitt@redhat.com>

integer/integer.go

@@ -18,47 +18,53 @@ package integer
 
 import "math"
 
-// IntMax returns the maximum of the params
+// IntMax returns the maximum of the params.
+// Deprecated: for new code, use the max() builtin instead.
 func IntMax(a, b int) int {
 	if b > a {
 		return b
 	}
 	return a
 }
 
-// IntMin returns the minimum of the params
+// IntMin returns the minimum of the params.
+// Deprecated: for new code, use the min() builtin instead.
 func IntMin(a, b int) int {
 	if b < a {
 		return b
 	}
 	return a
 }
 
-// Int32Max returns the maximum of the params
+// Int32Max returns the maximum of the params.
+// Deprecated: for new code, use the max() builtin instead.
 func Int32Max(a, b int32) int32 {
 	if b > a {
 		return b
 	}
 	return a
 }
 
-// Int32Min returns the minimum of the params
+// Int32Min returns the minimum of the params.
+// Deprecated: for new code, use the min() builtin instead.
 func Int32Min(a, b int32) int32 {
 	if b < a {
 		return b
 	}
 	return a
 }
 
-// Int64Max returns the maximum of the params
+// Int64Max returns the maximum of the params.
+// Deprecated: for new code, use the max() builtin instead.
 func Int64Max(a, b int64) int64 {
 	if b > a {
 		return b
 	}
 	return a
 }
 
-// Int64Min returns the minimum of the params
+// Int64Min returns the minimum of the params.
+// Deprecated: for new code, use the min() builtin instead.
 func Int64Min(a, b int64) int64 {
 	if b < a {
 		return b