azure-pipelines: use valid build number format

The ':' in the build number is not valid - remove it.

Signed-off-by: Matthew John Cheetham <mjcheetham@outlook.com>

Author: mjcheetham

.azure-pipelines/release.yml

@@ -109,7 +109,7 @@ extends:
                     echo "##vso[task.setvariable variable=tag_name;isOutput=true;isReadOnly=true]$tag_name"
                     echo "##vso[task.setvariable variable=tag_sha;isOutput=true;isReadOnly=true]$tag_sha"
                     rev=$(echo "$(Build.BuildNumber)" | grep -oE '[0-9]+$')
-                    echo "##vso[build.updatebuildnumber]${tag_name} (rev:${rev})"
+                    echo "##vso[build.updatebuildnumber]${tag_name} (rev ${rev})"
 
       - stage: build
         displayName: 'Build'