build(deps): bump github.com/aws/aws-sdk-go from 1.20.20 to 1.21.0 (#3022)

Bumps [github.com/aws/aws-sdk-go](https://github.com/aws/aws-sdk-go) from 1.20.20 to 1.21.0.
- [Release notes](https://github.com/aws/aws-sdk-go/releases)
- [Changelog](https://github.com/aws/aws-sdk-go/blob/master/CHANGELOG.md)
- [Commits](https://github.com/aws/aws-sdk-go/compare/v1.20.20...v1.21.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

go.mod

@@ -6,7 +6,7 @@ require (
 	cloud.google.com/go v0.41.0 // indirect
 	github.com/Shopify/sarama v1.21.0 // indirect
 	github.com/apache/thrift v0.12.0 // indirect
-	github.com/aws/aws-sdk-go v1.20.20
+	github.com/aws/aws-sdk-go v1.21.0
 	github.com/caddyserver/caddy v1.0.1
 	github.com/coreos/bbolt v1.3.2 // indirect
 	github.com/coreos/etcd v3.3.13+incompatible

go.sum

@@ -21,6 +21,8 @@ github.com/aws/aws-sdk-go v1.20.17 h1:ZQ0cM9FpuufVDHlNViD8vD68IkEQL/VUOMwJPBqkaa
 github.com/aws/aws-sdk-go v1.20.17/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/aws/aws-sdk-go v1.20.20 h1:OAR/GtjMOhenkp1NNKr1N1FgIP3mQXHeGbRhvVIAQp0=
 github.com/aws/aws-sdk-go v1.20.20/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
+github.com/aws/aws-sdk-go v1.21.0 h1:dRGzi4XZe5GFSJssHkRNUf/hRD/HL8bdqTYa9hpAO8c=
+github.com/aws/aws-sdk-go v1.21.0/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=