Update dependency plug_cowboy to v2.8.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
plug_cowboy (source)	prod	minor	2.6.1 → 2.8.0

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Release Notes

elixir-plug/plug_cowboy (plug_cowboy)

v2.8.0

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Enhancements

• Remove supported for deprecated next_protocols_advertised

v2.7.5

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Enhancements

• Ensure path too large request errors are correctly translated

v2.7.4

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Enhancements

• Ensure errors from Ranch are correctly translated

v2.7.3

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Enhancements

• Ensure errors from Cowboy 2.13 are correctly translated

v2.7.2

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Bug fixes

• Ensure crash_reason in metadata is always a tuple

v2.7.1

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Enhancements

• Support Cowboy 2.11

v2.7.0

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Enhancements

• Do not allow Cowboy 2.11 due to backwards incompatible changes

v2.6.2

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Enhancements

• Fix warnings on Elixir v1.15+

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