chore(deps): bump github.com/google/generative-ai-go

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] <[email protected]>

go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/bytecodealliance/wasmtime-go/v9 v9.0.0
 	github.com/caarlos0/env/v6 v6.10.1
 	github.com/fatih/color v1.18.0
-	github.com/google/generative-ai-go v0.18.0
+	github.com/google/generative-ai-go v0.19.0
 	github.com/hashicorp/golang-lru/v2 v2.0.7
 	github.com/invopop/jsonschema v0.12.0
 	github.com/joho/godotenv v1.5.1

go.sum

@@ -89,8 +89,8 @@ github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5y
 github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
 github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
 github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
-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/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=