[super-agent] Disable flux on renovatebot (#1368)

#### Is this a new chart
No

#### What this PR does / why we need it:

My mail is being flooded by flux upgrades because the PR of the upgrade
is not being merged.

We do not want to merge it (yet) and we will upgrade flux if it is
needed. If we remove the PR from renovate we remove also the possibility
of merging it by mistake.

#### Checklist
- [ ] Chart Version bumped
- [ ] Variables are documented in the README.md
- [x] Title of the PR starts with chart name (e.g. `[mychartname]`)

.github/renovate.json5

@@ -47,6 +47,14 @@
         "patch"
       ],
       "enabled": true
+    },
+    {
+      // Disable Flux for now.
+      "matchPackageNames": [
+        "flux",
+        "flux2",
+      ],
+      "enabled": false
     }
   ],
   "customManagers": [