Update dependency mysql1 to ^0.21.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
mysql1	dependencies	minor	^0.20.0 → ^0.21.0

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Release Notes

adamlofts/mysql1_dart (mysql1)

v0.21.1

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05 Oct 2026

• An account with a password on MySQL 8 can log in over a connection which
  is not TLS or a unix socket. A caching_sha2_password account has to send
  the server its password the first time it logs in, and the driver now
  encrypts it with the server's RSA public key, which it asks the server for.
  It used to refuse.
• ConnectionSettings.serverPublicKey takes that key in PEM, for anyone who
  would rather give it than have the server asked.

v0.21.0

--

05 Oct 2026

The connection has been rewritten, and most of this release is what that
fixed. Several changes are breaking.

Breaking:

• Requires Dart 3.0.
• The MySQL optimizer does not work well on prepared statements.
  Therefore, query parameters are now written into the statement as literals
  and sent as plain SQL, and prepared statements are no longer used. The
  connection character set must be utf8 or utf8mb4, and the server must not
  be in NO_BACKSLASH_ESCAPES mode.
• A query which times out closes the connection. Its response was otherwise
  liable to be taken for the answer to the next query.
• useSSL implemented.
• ConnectionSettings.useCompression is removed. It never worked.
• A DateTime parameter is sent with its fractional seconds, which the server
  rounds to the precision of the column. It used to be cut to whole seconds.
• Almost all FINE logging is gone.
• affectedRows is never null. For a statement which returns rows it is the
  number of rows, where it used to be null.
• ResultRow's constructor takes the result's schema, which breaks a subclass
  of it outside this package.

Added:

• The result API is closer to package:postgres, so code which reads rows
  looks the same against either driver. Results is now Result, a list of
  rows, and Field is now ResultSchemaColumn; the old names still work and
  are deprecated. Result and ResultRow have a schema, and ResultRow
  has toColumnMap() and isSqlNull().

Fixed:

• Logging in to MySQL 8 with a password. caching_sha2_password accounts
  left the connection one packet out of step, which showed up as the first
  query returning nothing, each query returning the previous query's rows,
  RangeError ... Not in inclusive range 0..5, "Got packets out of order" or
  "Socket has been closed". An account whose plugin is not the server's
  default now logs in too.
• A caching_sha2_password account the server has not cached can log in over
  TLS or a unix socket. Over plain TCP it is refused with a message saying so.
• CALL: every query after a stored procedure call returned the results of
  the one before it.
• DATETIME(n) and TIMESTAMP(n) parameters lost their fraction. Reading a
  TIME(n) column hung, and a negative TIME was read wrongly.
• A value of 16MB or more returned no rows, and a row which exactly filled a
  packet sent the driver into a loop ("Illegal length 0").
• A value which cannot be decoded, such as a POINT, fails the query at once.
  It used to hang until the timeout and close the connection.
• An error from the server part way through a result is reported instead of
  being dropped.

Performance:

• Reading a large result is about ten times faster.

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