minor #14334 14300 Add support for UUIDv6 in Uuid constraint (JohJohan)

This PR was submitted for the 5.1 branch but it was merged into the master branch instead.

Discussion
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14300 Add support for UUIDv6 in Uuid constraint

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Commits
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bf310c1 14300 Update support for Uuid 6

Author: javiereguiluz

reference/constraints/Uuid.rst

@@ -124,18 +124,19 @@ will allow alternate input formats like:
 ``versions``
 ~~~~~~~~~~~~
 
-**type**: ``int[]`` **default**: ``[1,2,3,4,5]``
+**type**: ``int[]`` **default**: ``[1,2,3,4,5,6]``
 
-This option can be used to only allow specific `UUID versions`_.  Valid versions are 1 - 5.
+This option can be used to only allow specific `UUID versions`_.  Valid versions are 1 - 6.
 The following PHP constants can also be used:
 
 * ``Uuid::V1_MAC``
 * ``Uuid::V2_DCE``
 * ``Uuid::V3_MD5``
 * ``Uuid::V4_RANDOM``
 * ``Uuid::V5_SHA1``
+* ``Uuid::V6_SORTABLE``
 
-All five versions are allowed by default.
+All six versions are allowed by default.
 
 .. _`Universally unique identifier (UUID)`: https://en.wikipedia.org/wiki/Universally_unique_identifier
 .. _`RFC 4122`: https://tools.ietf.org/html/rfc4122