Update dependency werkzeug to v3.1.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
werkzeug (changelog)	==3.1.4 → ==3.1.8

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Release Notes

pallets/werkzeug (werkzeug)

v3.1.8

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Released 2026-04-02

• Request.host and get_host return the empty string if the header is
  missing or has invalid characters. :issue:3142

v3.1.7

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Released 2026-03-23

• parse_list_header preserves partially quoted items, discards empty
  items, and returns empty for unclosed quoted values. :pr:3128
• WWWAuthenticate.to_header does not produce a trailing space when there
  are no parameters. :issue:3127
• Transfer-Encoding is parsed as a set. :pr:3134
• Request.host, get_host, and host_is_trusted validate the
  characters of the value. An empty value is no longer allowed. A Unix socket
  server address is ignored. The trusted_list argument to
  host_is_trusted is optional. :pr:3113
• Fix multipart form parser handling of newline at boundary. :issue:3088
• Response.make_conditional sets the Accept-Ranges header even if it
  is not a satisfiable range request. :issue:3108
• merge_slashes merges any number of consecutive slashes. :issue:3121

v3.1.6

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Released 2026-02-19

• safe_join on Windows does not allow special devices names in
  multi-segment paths. :ghsa:29vq-49wr-vm6x

v3.1.5

Compare Source

Released 2026-01-08

• safe_join on Windows does not allow more special device names, regardless
  of extension or surrounding spaces. :ghsa:87hc-h4r5-73f7
• The multipart form parser handles a \r\n sequence at a chunk boundary.
  This fixes the previous attempt, which caused incorrect content lengths.
  :issue:3065 :issue:3077
• Fix AttributeError when initializing DebuggedApplication with
  pin_security=False. :issue:3075

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