chore(deps): update yidadaa/chatgpt-next-web docker tag to v2.15.6 (#2373)

* chore(deps): update yidadaa/chatgpt-next-web docker tag to v2.15.6

* Update app version [skip ci]

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Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: github-action update-app-version <githubaction@githubaction.com>

apps/chatgpt-next-web/2.15.6/docker-compose.yml

@@ -12,7 +12,7 @@ services:
       - "PROXY_URL=${PROXY}"
       - "BASE_URL=${API_BASE_URL}"
       - "WHITE_WEBDAV_ENDPOINTS=${WHITE_WEBDAV_ENDPOINTS}"
-    image: yidadaa/chatgpt-next-web:2.15.5
+    image: yidadaa/chatgpt-next-web:v2.15.6
     labels:
       createdBy: "Apps"