Update to latest version of pbgouncer-exporter (#11150)

There was a problem with Mac version of pgbouncer exporter
created and released previously. This commit releases the
latest version making sure that Linux Go is used to build
the pgbouncer binary.
diff --git a/chart/dockerfiles/pgbouncer-exporter/build_and_push.sh b/chart/dockerfiles/pgbouncer-exporter/build_and_push.sh
index da204b6..308497e 100755
--- a/chart/dockerfiles/pgbouncer-exporter/build_and_push.sh
+++ b/chart/dockerfiles/pgbouncer-exporter/build_and_push.sh
@@ -24,7 +24,7 @@
 PGBOUNCER_EXPORTER_VERSION="0.5.0"
 readonly PGBOUNCER_EXPORTER_VERSION
 
-AIRFLOW_PGBOUNCER_EXPORTER_VERSION="2020.09.05"
+AIRFLOW_PGBOUNCER_EXPORTER_VERSION="2020.09.25"
 readonly AIRFLOW_PGBOUNCER_EXPORTER_VERSION
 
 EXPECTED_GO_VERSION="1.15.1"
diff --git a/chart/values.yaml b/chart/values.yaml
index 09912e6..1d582c7 100644
--- a/chart/values.yaml
+++ b/chart/values.yaml
@@ -141,7 +141,7 @@
     pullPolicy: IfNotPresent
   pgbouncerExporter:
     repository: apache/airflow
-    tag: airflow-pgbouncer-exporter-2020.09.05-0.5.0
+    tag: airflow-pgbouncer-exporter-2020.09.25-0.5.0
     pullPolicy: IfNotPresent
 
 # Environment variables for all airflow containers