[gomod] Bump gorm.io/gorm from 1.25.5 to 1.25.7 in /backend

[dependabot[bot]]

Bumps gorm.io/gorm from 1.25.5 to 1.25.7.

Commits

• 8fb9a31 refactor: part 2 of distinguish between Unique and UniqueIndex (#6822)
• 9514d5f let limit and offset use bind parameter (#6806)
• 46816ad refactor: distinguish between Unique and UniqueIndex (#6386)
• 418ee3f fix: preload shouldn't overwrite the value of join (#6771)
• e043924 chore(deps): bump actions/cache from 3 to 4 (#6802)
• 0123dd4 fix: ignore .gen.go suffix in logger to get the real caller when using gen #6...
• 940358e Fix tests doesn't follow https://gorm.io/docs/method_chaining.html convention
• 87decce fix: ExplainSQL using consecutive pairs of escaper in SQL string represents a...
• 436cca7 fix: join and select mytable.* not working (#6761)
• a2cac75 feature: bring custom type and id column name to polymorphism (#6716)
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #678.