Update registry Docker tag to v3

| datasource | package  | from | to |
| ---------- | -------- | ---- | -- |
| docker     | registry | 2    | 3  |


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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -53,7 +53,7 @@ jobs:
     needs: unit-tests
     services:
       registry:
-        image: registry:2
+        image: registry:3
         ports:
           - 5000:5000
     steps: