chore: Update ghcr.io/grafana/grafana-build-tools Docker tag to v1.23.0

| datasource | package                             | from   | to      |
| ---------- | ----------------------------------- | ------ | ------- |
| docker     | ghcr.io/grafana/grafana-build-tools | 1.21.3 | v1.23.0 |


Signed-off-by: renovate-sh-app[bot] <219655108+renovate-sh-app[bot]@users.noreply.github.com>

Author: renovate-sh-app[bot]

.gbt.mk

@@ -4,4 +4,4 @@
 # and a shell script. This is achieved by using the `VAR=value` syntax, which
 # is valid in both Makefile and shell.
 
-GBT_IMAGE=ghcr.io/grafana/grafana-build-tools:1.21.3
+GBT_IMAGE=ghcr.io/grafana/grafana-build-tools:v1.23.0

.github/workflows/build_and_publish.yaml

@@ -55,7 +55,7 @@ jobs:
           - /var/run/docker.sock:/var/run/docker.sock:ro
 
     container:
-      image: ghcr.io/grafana/grafana-build-tools:1.21.3@sha256:fea3d7e1e24a9f9c68d7b0e56a25ced5877f376c66558c1197d568e4b9142f97
+      image: ghcr.io/grafana/grafana-build-tools:v1.23.0@sha256:173916af15668a9a2837e038d5dea445b3888cbab97cd572dc2b3d961c982c83
       volumes:
         # This works as long as we are using self-hosted runners.
         #

.github/workflows/validate_pr.yaml

@@ -21,7 +21,7 @@ jobs:
       contents: read
 
     container:
-      image: ghcr.io/grafana/grafana-build-tools:1.21.3@sha256:fea3d7e1e24a9f9c68d7b0e56a25ced5877f376c66558c1197d568e4b9142f97
+      image: ghcr.io/grafana/grafana-build-tools:v1.23.0@sha256:173916af15668a9a2837e038d5dea445b3888cbab97cd572dc2b3d961c982c83
       volumes:
         # This works as long as we are using self-hosted runners.
         #