Revert "bazel: Use canonical reproducible load_bazlets rule"

This reverts commit a7246ed.

Since bazel v6.1.0 the warning about shallow_since has been removed
since it was determined [1] to be potentially harmful to build
performance and reliability.

[1] bazelbuild/bazel#12857

Change-Id: I6003ae03511bdc7b5ba2cbb6b15b928bba18bfb5

WORKSPACE

@@ -6,7 +6,6 @@ load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
     commit = "b6120a9fa50945d38f0a4d55d5879e3ec465c5e5",
-    shallow_since = "1701477032 -0700",
     #local_path = "/home/<user>/projects/bazlets",
 )
 

bazlets.bzl

@@ -4,14 +4,12 @@ NAME = "com_googlesource_gerrit_bazlets"
 
 def load_bazlets(
         commit,
-        shallow_since = None,
         local_path = None):
     if not local_path:
         git_repository(
             name = NAME,
             remote = "https://gerrit.googlesource.com/bazlets",
             commit = commit,
-            shallow_since = shallow_since,
         )
     else:
         native.local_repository(