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One use is not going to fail you.

113 days is also beyond the 90 day point where the metabolites start to break down. The belief that once the THC is in your hair, it stays there without breaking...

Yes, the cutoff was decreased. But the cutoff is already so minuscule that it is extremely unlikely that you would fail with the new cutoff. They have reduced detection by 10 trillionths of a gram.
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You're going to be fine.

I'll summarize what you would find if you researched DrBill's old posts on this forum and the research articles that he cited.

THC metabollites do not actively bond in...

Multiple factors to keep in mind here/