Update runtime to v0.18.4 (#324)

Description of changes:
- Update runtime to `v0.18.4`

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

go.mod

@@ -3,7 +3,7 @@ module github.com/aws-controllers-k8s/code-generator
 go 1.17
 
 require (
-	github.com/aws-controllers-k8s/runtime v0.18.3
+	github.com/aws-controllers-k8s/runtime v0.18.4
 	github.com/aws/aws-sdk-go v1.42.0
 	github.com/dlclark/regexp2 v1.4.0
 	// pin to v0.1.1 due to release problem with v0.1.2

go.sum

@@ -90,8 +90,8 @@ github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPd
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
 github.com/asaskevich/govalidator v0.0.0-20180720115003-f9ffefc3facf/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
 github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
-github.com/aws-controllers-k8s/runtime v0.18.3 h1:8U/lqvW7NwRiyMnx/yk1hxrjDs0NONfAHWYE1bvhx/E=
-github.com/aws-controllers-k8s/runtime v0.18.3/go.mod h1:pK+LlQRxxWKC9mRHnGz8/WRI8Dcvjg4ZGmK8rVwb51Y=
+github.com/aws-controllers-k8s/runtime v0.18.4 h1:iwLYNwhbuiWZrHPoulGj75oT+alE91wCNkF1FUELiAw=
+github.com/aws-controllers-k8s/runtime v0.18.4/go.mod h1:oA8ML1/LL3chPn26P6SzBNu1CUI2nekB+PTqykNs0qU=
 github.com/aws/aws-sdk-go v1.42.0 h1:BMZws0t8NAhHFsfnT3B40IwD13jVDG5KerlRksctVIw=
 github.com/aws/aws-sdk-go v1.42.0/go.mod h1:585smgzpB/KqRA+K3y/NL/oYRqQvpNJYvLm+LY1U59Q=
 github.com/benbjohnson/clock v1.0.3/go.mod h1:bGMdMPoPVvcYyt1gHDf4J2KE153Yf9BuiUKYMaxlTDM=
@@ -109,6 +109,7 @@ github.com/blang/semver v3.5.1+incompatible h1:cQNTCjp13qL8KC3Nbxr/y2Bqb63oX6wdn
 github.com/blang/semver v3.5.1+incompatible/go.mod h1:kRBLl5iJ+tD4TcOOxsy/0fnwebNt5EWlYSAyrTnjyyk=
 github.com/blang/semver/v4 v4.0.0 h1:1PFHFE6yCCTv8C1TeyNNarDzntLi7wMI5i/pzqYIsAM=
 github.com/blang/semver/v4 v4.0.0/go.mod h1:IbckMUScFkM3pff0VJDNKRiT6TG/YpiHIM2yvyW5YoQ=
+github.com/cenkalti/backoff/v4 v4.1.2/go.mod h1:scbssz8iZGpm3xbr14ovlUdkxfGXNInqkPWOWmG2CLw=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/certifi/gocertifi v0.0.0-20191021191039-0944d244cd40/go.mod h1:sGbDF6GwGcLpkNXPUTkMRoywsNa/ol15pxFe6ERfguA=
 github.com/certifi/gocertifi v0.0.0-20200922220541-2c3bb06c6054/go.mod h1:sGbDF6GwGcLpkNXPUTkMRoywsNa/ol15pxFe6ERfguA=