mod: bump github.com/google/generative-ai-go from 0.18.0 to 0.19.0

Bumps [github.com/google/generative-ai-go](https://github.com/google/generative-ai-go) from 0.18.0 to 0.19.0.
- [Release notes](https://github.com/google/generative-ai-go/releases)
- [Commits](google/generative-ai-go@v0.18.0...v0.19.0)

---
updated-dependencies:
- dependency-name: github.com/google/generative-ai-go
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

go.mod

@@ -18,7 +18,7 @@ require (
 	github.com/golang-migrate/migrate/v4 v4.18.1
 	github.com/golangci/golangci-lint v1.62.2
 	github.com/google/flatbuffers v24.3.25+incompatible
-	github.com/google/generative-ai-go v0.18.0
+	github.com/google/generative-ai-go v0.19.0
 	github.com/google/go-cmp v0.6.0
 	github.com/google/uuid v1.6.0
 	github.com/gorilla/handlers v1.5.2

go.sum

@@ -954,8 +954,8 @@ github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ
 github.com/google/flatbuffers v2.0.8+incompatible/go.mod h1:1AeVuKshWv4vARoZatz6mlQ0JxURH0Kv5+zNeJKJCa8=
 github.com/google/flatbuffers v24.3.25+incompatible h1:CX395cjN9Kke9mmalRoL3d81AtFUxJM+yDthflgJGkI=
 github.com/google/flatbuffers v24.3.25+incompatible/go.mod h1:1AeVuKshWv4vARoZatz6mlQ0JxURH0Kv5+zNeJKJCa8=
-github.com/google/generative-ai-go v0.18.0 h1:6ybg9vOCLcI/UpBBYXOTVgvKmcUKFRNj+2Cj3GnebSo=
-github.com/google/generative-ai-go v0.18.0/go.mod h1:JYolL13VG7j79kM5BtHz4qwONHkeJQzOCkKXnpqtS/E=
+github.com/google/generative-ai-go v0.19.0 h1:R71szggh8wHMCUlEMsW2A/3T+5LdEIkiaHSYgSpUgdg=
+github.com/google/generative-ai-go v0.19.0/go.mod h1:JYolL13VG7j79kM5BtHz4qwONHkeJQzOCkKXnpqtS/E=
 github.com/google/gnostic-models v0.6.8 h1:yo/ABAfM5IMRsS1VnXjTBvUb61tFIHozhlYvRgGre9I=
 github.com/google/gnostic-models v0.6.8/go.mod h1:5n7qKqH0f5wFt+aWF8CW6pZLLNOfYuF5OpfBSENuI8U=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=