bump pingmesh to 1.2.1 (#4260)

Signed-off-by: drfaust92 <[email protected]>

charts/prometheus-pingmesh-exporter/Chart.yaml

@@ -1,17 +1,17 @@
 apiVersion: v2
-appVersion: "v1.1.0"
+appVersion: "v1.2.1"
 description: Prometheus Pingmesh Exporter
 home: https://stack.kubeservice.cn/
 icon: https://raw.githubusercontent.com/prometheus/prometheus.github.io/master/assets/prometheus_logo-cb55bb5c346.png
 keywords:
-- prometheus
-- pingmesh
-- monitoring
+  - prometheus
+  - pingmesh
+  - monitoring
 maintainers:
-- email: [email protected]
-  name: dongjiang1989
+  - email: [email protected]
+    name: dongjiang1989
 name: prometheus-pingmesh-exporter
 sources:
-- https://github.com/kubeservice-stack/pingmesh-agent
+  - https://github.com/kubeservice-stack/pingmesh-agent
 type: application
-version: 0.3.0
+version: 0.4.0