v-m/blackbox: Switch to upstream container image

I found the official container image for Prometheus Blackbox exporter.
It is hosted on Quay, which is why I didn't see it on Docker Hub when I
looked initially.

victoria-metrics/blackbox-exporter.yaml

@@ -34,7 +34,7 @@ spec:
     spec:
       containers:
       - name: blackbox-exporter
-        image: docker.io/bitnami/blackbox-exporter:0.24.0
+        image: quay.io/prometheus/blackbox-exporter:v0.24.0
         args:
         - --config.file=/etc/blackbox-exporter/blackbox.yml
         ports:
@@ -52,7 +52,6 @@ spec:
           failureThreshold: 30
           timeoutSeconds: 1
         securityContext:
-          runAsNonRoot: true
           readOnlyRootFilesystem: true
         volumeMounts:
         - mountPath: /etc/blackbox-exporter
@@ -63,6 +62,8 @@ spec:
           subPath: tmp
       securityContext:
         runAsNonRoot: true
+        runAsUser: 1422
+        runAsGroup: 1422
         sysctls:
         - name: net.ipv4.ping_group_range
           value: 0 65536