communitybridge/easycla: cla-backend-go/config/ssm.go; 14 LoC

Found a possible issue in [communitybridge/easycla](https://www.github.com/communitybridge/easycla) at [cla-backend-go/config/ssm.go](https://github.com/communitybridge/easycla/blob/232f9d9dcfbccd8531f6feb4c44a62e80490fa07/cla-backend-go/config/ssm.go#L94-L107)

Below is the message reported by the analyzer for this snippet of code. Beware that the analyzer only reports the first
issue it finds, so please do not limit your consideration to the contents of the below message.

> range-loop variable key used in defer or goroutine at line 103

[Click here to see the code in its original context.](https://github.com/communitybridge/easycla/blob/232f9d9dcfbccd8531f6feb4c44a62e80490fa07/cla-backend-go/config/ssm.go#L94-L107)

Click here to show the 14 line(s) of Go which triggered the analyzer.

```go
for _, key := range ssmKeys {
// Create a go routine to this concurrently
go func(theKey string) {
theValue, err := getSSMString(ssmClient, theKey)
if err != nil {
log.WithFields(f).WithError(err).Fatalf("error looking up key: %s", theKey)
}
// Send the response back through the channel
responseChannel <- configLookupResponse{
key: theKey,
value: theValue,
}
}(key)
}

```

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See the descriptions of the classifications [here](https://github.com/github-vet/rangeclosure-findings#how-can-i-help) for more information.

commit ID: 232f9d9dcfbccd8531f6feb4c44a62e80490fa07