bump version to v2.6.0 (#2039)

.github/workflows/docker.yml

@@ -11,7 +11,7 @@ on:
       image_tag:
         description: 'Tag for this image build'
         type: string
-        default: 'v2.5.0'
+        default: 'v2.6.0'
         required: true
       mark_latest:
         description: 'Mark this image as latest'

.github/workflows/release.yml

@@ -18,7 +18,7 @@ on:
       version:
         description: 'Version for this release'
         type: string
-        default: 'v2.5.0'
+        default: 'v2.6.0'
         required: true
       make_latest:
         description: 'Mark this release as latest'