various: prefer ints.between over enum for int ranges

nixos/modules/services/monitoring/nezha-agent.nix

@@ -98,12 +98,7 @@ in
               '';
             };
             report_delay = lib.mkOption {
-              type = lib.types.enum [
-                1
-                2
-                3
-                4
-              ];
+              type = lib.types.ints.between 1 4;
               default = 3;
               description = ''
                 The interval between system status reportings.

nixos/modules/services/security/cfssl.nix

@@ -154,14 +154,7 @@ in
 
     logLevel = lib.mkOption {
       default = 1;
-      type = lib.types.enum [
-        0
-        1
-        2
-        3
-        4
-        5
-      ];
+      type = lib.types.ints.between 0 5;
       description = "Log level (0 = DEBUG, 5 = FATAL).";
     };
 

nixos/modules/services/security/opensnitch.nix

@@ -108,13 +108,7 @@ in
             };
 
             LogLevel = lib.mkOption {
-              type = lib.types.enum [
-                0
-                1
-                2
-                3
-                4
-              ];
+              type = lib.types.ints.between 0 4;
               description = ''
                 Default log level from 0 to 4 (debug, info, important, warning,
                 error).