Fix capitalization of beta label

We show it as is.

Author: tombruijn

dashboards/cloudwatch/main.json

@@ -2,7 +2,7 @@
   "metric_keys": [
     "aws_cloudwatch_metricstreams_metric_update"
   ],
-  "label": "beta",
+  "label": "Beta",
   "dashboard": {
     "title": "AWS/CloudWatch",
     "description": "Monitor AWS CloudWatch Metric Streams performance and error rates.",

dashboards/firehose/main.json

@@ -2,7 +2,7 @@
   "metric_keys": [
     "aws_firehose_incoming_records"
   ],
-  "label": "beta",
+  "label": "Beta",
   "dashboard": {
     "title": "AWS/Firehose",
     "description": "Monitor AWS Firehose delivery streams performance, throughput, and error rates.",

dashboards/lambda/main.json

@@ -2,7 +2,7 @@
   "metric_keys": [
     "aws_lambda_invocations"
   ],
-  "label": "beta",
+  "label": "Beta",
   "dashboard": {
     "title": "AWS/Lambda",
     "description": "Monitor AWS Lambda function performance, invocations, errors, and concurrency metrics.",

dashboards/route53/main.json

@@ -2,7 +2,7 @@
   "metric_keys": [
     "aws_route53_dns_queries"
   ],
-  "label": "beta",
+  "label": "Beta",
   "dashboard": {
     "title": "AWS/Route53",
     "description": "Monitor AWS Route53 DNS queries and health checks.",