Update grafana/promtail Docker tag to v3

Author: renovate[bot]

.env

@@ -12,6 +12,6 @@ OTEL_COLLECTOR_IMAGE_NAME=otel/opentelemetry-collector-contrib:0.130.0
 OTEL_COLLECTOR_HOST_PORT_PROMETHEUS=8889
 OTEL_COLLECTOR_HOST_PORT_GRPC=4317
 OTEL_COLLECTOR_HOST_PORT_HTTP=4318
-PROMTAIL_IMAGE_NAME=grafana/promtail:2.9.15
+PROMTAIL_IMAGE_NAME=grafana/promtail:3.5.4
 PYROSCOPE_IMAGE_NAME=grafana/pyroscope:1.14.1
 PYROSCOPE_PORT=4040