build: pin codegen tool versions

`latest` for oapi-codegen, mockery, and sqlc in mise.toml let fresh
CI runs pull newer generators than whatever produced the committed
files, breaking the Verify generated code check (local 2.4.1 vs CI
2.6.0 for oapi-codegen). Pin all three and regenerate api/api.gen.go
with oapi-codegen 2.6.0.

Signed-off-by: Gabriel Harris-Rouquette <gabizou@me.com>

Author: gabizou

api/api.gen.go

@@ -2,6 +2,6 @@
 go = "1.26"
 "go:github.com/golang-migrate/migrate/v4/cmd/migrate" = { version = "latest", tags = "postgres" }
 golangci-lint = "2.11.4"
-mockery = "latest"
-oapi-codegen = "latest"
-sqlc = "latest"
+mockery = "3.7.0"
+oapi-codegen = "2.6.0"
+sqlc = "1.30.0"