Fix issues parsing null task dates from AM

Bump amclient to v0.4.1-0.20240705155055-0c5abef5207c.

go.mod

@@ -43,7 +43,7 @@ require (
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.18.2
 	github.com/stretchr/testify v1.9.0
-	go.artefactual.dev/amclient v0.3.0
+	go.artefactual.dev/amclient v0.4.1-0.20240705155055-0c5abef5207c
 	go.artefactual.dev/tools v0.14.0
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.49.0
 	go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace v0.49.0

go.sum

@@ -937,8 +937,8 @@ github.com/yuin/gopher-lua v1.1.1 h1:kYKnWBjvbNP4XLT3+bPEwAXJx262OhaHDWDVOPjL46M
 github.com/yuin/gopher-lua v1.1.1/go.mod h1:GBR0iDaNXjAgGg9zfCvksxSRnQx76gclCIb7kdAd1Pw=
 github.com/zclconf/go-cty v1.14.1 h1:t9fyA35fwjjUMcmL5hLER+e/rEPqrbCK1/OSE4SI9KA=
 github.com/zclconf/go-cty v1.14.1/go.mod h1:VvMs5i0vgZdhYawQNq5kePSpLAoz8u1xvZgrPIxfnZE=
-go.artefactual.dev/amclient v0.3.0 h1:biXZobSWJCzwpJOYtlQzOkClOv2u5mB1TKA4023B7zw=
-go.artefactual.dev/amclient v0.3.0/go.mod h1:jAJ98cSJ7QDSgMq/YUkmGpAJ4ssSzbIUN7XpynCa6uA=
+go.artefactual.dev/amclient v0.4.1-0.20240705155055-0c5abef5207c h1:kMgKuV9yx0LTQpkWdPxPC4GHAKMS9pDQ0x3CD8SmLfI=
+go.artefactual.dev/amclient v0.4.1-0.20240705155055-0c5abef5207c/go.mod h1:oAOlZHC78IWjWDCqRM1/8K1x/WYmRUL3peujKCdoXaA=
 go.artefactual.dev/tools v0.14.0 h1:ESLbemsnkdIPmYXtz0uZTcPqVnTUXIEZd9DSTRyTZqY=
 go.artefactual.dev/tools v0.14.0/go.mod h1:5RJ7ObocHZv/zQFYFv/zG9cW/UVRGPFywcJx/oQ+TG8=
 go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=