prepare for 1.5.1 release

Signed-off-by: Mark Nelson <mark.x.nelson@oracle.com>

Author: markxnelson

README.md

@@ -475,7 +475,7 @@ docker run -it --rm \
     -e DB_PASSWORD=Welcome12345 \
     -e DB_CONNECT_STRING=free23ai:1521/freepdb \
     -p 9161:9161 \
-    container-registry.oracle.com/database/observability-exporter:1.5.0
+    container-registry.oracle.com/database/observability-exporter:1.5.1
 ```
 
 ##### Using a wallet
@@ -506,7 +506,7 @@ docker run -it --rm \
     -e DB_CONNECT_STRING=devdb_tp \
     -v ./wallet:/wallet \
     -p 9161:9161 \
-    container-registry.oracle.com/database/observability-exporter:1.5.0
+    container-registry.oracle.com/database/observability-exporter:1.5.1
 ```
 > **Note:** If you are using `podman` you must specify the `:z` suffix on the volume mount so that the container will be able to access the files in the volume.  For example: `-v ./wallet:/wallet:z`
 
@@ -796,7 +796,7 @@ An exmaple of [custom metrics for Transacational Event Queues](./custom-metrics-
 If you run the exporter as a container image and want to include your custom metrics in the image itself, you can use the following example `Dockerfile` to create a new image:
 
 ```Dockerfile
-FROM container-registry.oracle.com/database/observability-exporter:1.5.0
+FROM container-registry.oracle.com/database/observability-exporter:1.5.1
 COPY custom-metrics.toml /
 ENTRYPOINT ["/oracledb_exporter", "--custom.metrics", "/custom-metrics.toml"]
 ```

kubernetes/metrics-exporter-deployment.yaml

@@ -17,7 +17,7 @@ spec:
     spec:
       containers:
       - name: metrics-exporter
-        image: container-registry.oracle.com/database/observability-exporter:1.0.0
+        image: container-registry.oracle.com/database/observability-exporter:1.5.1
         imagePullPolicy: Always
         env:
           # uncomment and customize the next item if you want to provide custom metrics definitions