fix: Server crash when opening timeline tab for big workflows (#6369)

Signed-off-by: Alexander Matyushentsev <AMatyushentsev@gmail.com>

Co-authored-by: Saravanan Balasubramanian <33908564+sarabala1979@users.noreply.github.com>
Co-authored-by: Alex Collins <alexec@users.noreply.github.com>

go.mod

@@ -13,7 +13,7 @@ require (
 	github.com/aliyun/aliyun-oss-go-sdk v2.1.8+incompatible
 	github.com/antonmedv/expr v1.8.8
 	github.com/argoproj/argo-events v1.2.0
-	github.com/argoproj/pkg v0.8.1
+	github.com/argoproj/pkg v0.9.1
 	github.com/baiyubin/aliyun-sts-go-sdk v0.0.0-20180326062324-cfa1a18b161f // indirect
 	github.com/blushft/go-diagrams v0.0.0-20201006005127-c78c821223d9
 	github.com/colinmarc/hdfs v1.1.4-0.20180805212432-9746310a4d31

go.sum

@@ -124,8 +124,8 @@ github.com/ardielle/ardielle-go v1.5.2/go.mod h1:I4hy1n795cUhaVt/ojz83SNVCYIGsAF
 github.com/ardielle/ardielle-tools v1.5.4/go.mod h1:oZN+JRMnqGiIhrzkRN9l26Cej9dEx4jeNG6A+AdkShk=
 github.com/argoproj/argo-events v1.2.0 h1:CjF8hVUkeflhaOt9uWjJK6ai6b4pw0CCUUmOnmhWnNY=
 github.com/argoproj/argo-events v1.2.0/go.mod h1:eY+egQNBLXAz/AF4mqgHsMMa4Aur7frHjUfBg+RpX04=
-github.com/argoproj/pkg v0.8.1 h1:9h/sqAjUNyk0LaHkXR+2h94KNcSchvFX5aELNjXSOoc=
-github.com/argoproj/pkg v0.8.1/go.mod h1:ra+bQPmbVAoEL+gYSKesuigt4m49i3Qa3mE/xQcjCiA=
+github.com/argoproj/pkg v0.9.1 h1:osfOS3QkzfRf+W43lbCZb0o0bzrBweQhL+U3rgEg+5M=
+github.com/argoproj/pkg v0.9.1/go.mod h1:ra+bQPmbVAoEL+gYSKesuigt4m49i3Qa3mE/xQcjCiA=
 github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
 github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=