fix langsmith example

examples/langsmith-llm-example/go.mod

@@ -1,19 +1,20 @@
-module github.com/tmc/langchaingo/examples/openai-gpt4o-example
+module github.com/tmc/langchaingo/examples/langsmith-llm-example
 
 go 1.22.0
 
 toolchain go1.22.1
 
-require github.com/tmc/langchaingo v0.1.13-pre.0
+require (
+	github.com/google/uuid v1.6.0
+	github.com/tmc/langchaingo v0.1.13-pre.0
+)
 
 require (
 	github.com/Masterminds/goutils v1.1.1 // indirect
 	github.com/Masterminds/semver/v3 v3.2.0 // indirect
 	github.com/Masterminds/sprig/v3 v3.2.3 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dlclark/regexp2 v1.10.0 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
-	github.com/google/uuid v1.6.0 // indirect
 	github.com/goph/emperror v0.17.2 // indirect
 	github.com/huandu/xstrings v1.3.3 // indirect
 	github.com/imdario/mergo v0.3.13 // indirect