docs: update references to renovate/renovate (#32711)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

docs/usage/docker.md

@@ -478,7 +478,7 @@ Make sure to install the Google Cloud SDK into the custom image, as you need the
 For example:
 
 ```Dockerfile
-FROM renovate/renovate:39.19.1
+FROM renovate/renovate:39.28.0
 # Include the "Docker tip" which you can find here https://cloud.google.com/sdk/docs/install
 # under "Installation" for "Debian/Ubuntu"
 RUN ...

docs/usage/examples/self-hosting.md

@@ -25,8 +25,8 @@ It builds `latest` based on the `main` branch and all SemVer tags are published
 ```sh title="Example of valid tags"
 docker run --rm renovate/renovate
 docker run --rm renovate/renovate:39
-docker run --rm renovate/renovate:39.19
-docker run --rm renovate/renovate:39.19.1
+docker run --rm renovate/renovate:39.28
+docker run --rm renovate/renovate:39.28.0
 ```
 
 <!-- prettier-ignore -->
@@ -62,7 +62,7 @@ spec:
             - name: renovate
               # Update this to the latest available and then enable Renovate on
               # the manifest
-              image: renovate/renovate:39.19.1
+              image: renovate/renovate:39.28.0
               args:
                 - user/repo
               # Environment Variables
@@ -121,7 +121,7 @@ spec:
       template:
         spec:
           containers:
-            - image: renovate/renovate:39.19.1
+            - image: renovate/renovate:39.28.0
               name: renovate-bot
               env: # For illustration purposes, please use secrets.
                 - name: RENOVATE_PLATFORM
@@ -367,7 +367,7 @@ spec:
           containers:
             - name: renovate
               # Update this to the latest available and then enable Renovate on the manifest
-              image: renovate/renovate:39.19.1
+              image: renovate/renovate:39.28.0
               volumeMounts:
                 - name: ssh-key-volume
                   readOnly: true