fix(atlantis): AWS credentials toYaml error (#21554)

Signed-off-by: Scott Crooks <scott.crooks@gmail.com>

stable/atlantis/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v1
 appVersion: "v0.11.1"
 description: A Helm chart for Atlantis https://www.runatlantis.io
 name: atlantis
-version: 3.11.1
+version: 3.11.2
 keywords:
 - terraform
 home: https://www.runatlantis.io

stable/atlantis/templates/secret-aws.yaml

@@ -10,7 +10,7 @@ metadata:
     heritage: {{ .Release.Service }}
 data:
 {{- if .Values.aws.credentials }}
-  credentials: {{ toYaml .Values.aws.credentials | b64enc }}
+  credentials: {{ .Values.aws.credentials | b64enc }}
 {{- end }}
   config: {{ .Values.aws.config | b64enc }}
 {{- end -}}