Revert "bazel: Use canonical reproducible load_bazlets rule"

This reverts commit 5e3a41afdd98896d2f9d3279f1e5a144ca051379.

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] https://github.com/bazelbuild/bazel/issues/12857

Change-Id: Id9b44d260688b706a15be5df20d5a80e0968c548