Temporarily remove standard libs as weak deps #88
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As noted in #86 (comment), currently our MCMCDiagnosticTools extension will fail to load unless a user explicitly loads Random, since it is in the stdlib. This is due to a bug in v1.11 described in JuliaLang/julia#56426. A fix for this will hopefully will be backported to v1.11.2.
This PR simply makes Random a full dependency always instead of a weak dep. After the bug is fixed in Julia, this PR should be reverted.