Update dependency myxql to v0.7.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
myxql (source)	prod	minor	0.6.4 -> 0.7.1

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Release Notes

elixir-ecto/myxql (myxql)

v0.7.1

Compare Source

• Add :ER_CHECK_CONSTRAINT_VIOLATED error code

v0.7.0

Compare Source

• Add :enable_cleartext_plugin option

  • Filter client capabilities that can't be met by server

  • Fix float/double parsing for text protocol when fractional part is missing

  • Fix setting :socket_options, they are now merged

  • :ssl_opts is deprecated in favor of ssl: options

  • ssl: true now emits a warning, as it does not execute server certificate verification

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