Increase verifier length per RFC7636 (#1549)
Increase verifier length per RFC7636 (#1549)

NOTE: The code verifier SHOULD have enough entropy to make it
   impractical to guess the value.  It is RECOMMENDED that the output of
   a suitable random number generator be used to create a 32-octet
   sequence.  The octet sequence is then base64url-encoded to produce a
   43-octet URL safe string to use as the code verifier.
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