build(deps): bump github.com/aws/aws-sdk-go in /detectors/aws/ec2 (#1029

)

Bumps [github.com/aws/aws-sdk-go](https://github.com/aws/aws-sdk-go) from 1.40.27 to 1.40.28.
- [Release notes](https://github.com/aws/aws-sdk-go/releases)
- [Changelog](https://github.com/aws/aws-sdk-go/blob/main/CHANGELOG.md)
- [Commits](aws/aws-sdk-go@v1.40.27...v1.40.28)

---
updated-dependencies:
- dependency-name: github.com/aws/aws-sdk-go
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

detectors/aws/ec2/go.mod

@@ -3,7 +3,7 @@ module go.opentelemetry.io/contrib/detectors/aws/ec2
 go 1.15
 
 require (
-	github.com/aws/aws-sdk-go v1.40.27
+	github.com/aws/aws-sdk-go v1.40.28
 	github.com/stretchr/testify v1.7.0
 	go.opentelemetry.io/otel v1.0.0-RC2
 	go.opentelemetry.io/otel/sdk v1.0.0-RC2

detectors/aws/ec2/go.sum

@@ -1,5 +1,5 @@
-github.com/aws/aws-sdk-go v1.40.27 h1:8fWW0CpmBZ8WWduNwl4vE9t07nMYFrhAsUHjPj81qUM=
-github.com/aws/aws-sdk-go v1.40.27/go.mod h1:585smgzpB/KqRA+K3y/NL/oYRqQvpNJYvLm+LY1U59Q=
+github.com/aws/aws-sdk-go v1.40.28 h1:IWzkX36BHx9R4jYd5y8NAudk8sxUeJHHohZgPI9kq/A=
+github.com/aws/aws-sdk-go v1.40.28/go.mod h1:585smgzpB/KqRA+K3y/NL/oYRqQvpNJYvLm+LY1U59Q=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/google/go-cmp v0.5.6 h1:BKbKCqvP6I+rmFHt06ZmyQtvB8xAkWdhFyr0ZUNZcxQ=