fixes #20285; prevent oid time overflow at year 2038 (#20338)

* Revert "fixes  #20285; prevent oid time overflow at year 2038"

This reverts commit dfcdb6ec2a.

* increase time to 64 bits and clean up

* add testcase

* inline consts

* add a changelog

* fixes  #20285; prevent oid time overflow at year 2038

tests/stdlib/toids.nim

@@ -1,6 +1,15 @@
+discard """
+  matrix: "--mm:refc; --mm:orc"
+"""
+
 import std/oids
 
 
 block: # genOid
   let x = genOid()
-  doAssert ($x).len == 24
+  doAssert ($x).len == 32
+
+block:
+  let x = genOid()
+  let y = parseOid(cstring($x))
+  doAssert x == y