build(deps): bump sequel from 5.102.0 to 5.103.0

[dependabot]

Bumps sequel from 5.102.0 to 5.103.0.

Changelog

Sourced from sequel's changelog.

=== 5.103.0 (2026-04-01)

• Have column and add_column in the generators warn if option values override argument values (jeremyevans)

• Show method name causing change migration to be irreversible in exception message (jeremyevans)

• Make dirty plugin handle the Model#[]= calls with keys that are not model columns (jeremyevans) (#2357)

• Soft-deprecate the jdbc/derby adapter, as Derby is no longer supported upstream (jeremyevans)

• Add lit_require_frozen extension, for disallowing usage of unfrozen strings as literal SQL (jeremyevans)

• Avoid creating multiple strings when passing literal string to dataset filtering method (jeremyevans)

Commits

• 37f97a1 Bump version to 5.103.0
• 8792c73 Update specs to work with minitest 6.0.3
• 23634d8 Have column and add_column in the generators warn if option values override a...
• fb3df68 Simplify code in lit_require_frozen
• 930b886 Show method name causing change migration to be irreversible in exception mes...
• 1d68f77 Always call super in Model#change_column_value in dirty plugin
• 5c48c9d Make dirty plugin handle the Model#[]= calls with keys that are not model col...
• e849fd3 Fix doc typo: s/get get/to get/
• 66e72a3 Document potential security concerns in the serialization plugin
• df447b4 Use start_with? in the serialization plugin
• Additional commits viewable in compare view

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