'lock levels' are deprecated, now a noop (#20539)

* 'lock levels' are deprecated, now a noop

* fixes tests

tests/closure/tclosure.nim

@@ -65,7 +65,7 @@ block tclosure:
 
   # bug #5015
 
-  type Mutator = proc(matched: string): string {.noSideEffect, gcsafe, locks: 0.}
+  type Mutator = proc(matched: string): string {.noSideEffect, gcsafe.}
 
   proc putMutated(
       MutatorCount: static[int],

tests/closure/tinvalidclosure.nim

@@ -1,5 +1,5 @@
 discard """
-  errormsg: "type mismatch: got <proc (x: int){.nimcall, gcsafe, locks: 0.}>"
+  errormsg: "type mismatch: got <proc (x: int){.nimcall, gcsafe.}>"
   line: 12
 """
 

tests/closure/tinvalidclosure5.nim

@@ -1,5 +1,5 @@
 discard """
-  errormsg: "type mismatch: got <proc (){.closure, gcsafe, locks: 0.}> but expected 'A = proc (){.nimcall.}'"
+  errormsg: "type mismatch: got <proc (){.closure, gcsafe.}> but expected 'A = proc (){.nimcall.}'"
   line: 9
 """
 

tests/closure/tnested.nim

@@ -33,7 +33,7 @@ py
 py
 px
 6
-proc (){.closure, gcsafe, locks: 0.}
+proc (){.closure, gcsafe.}
 '''
 """