chore(deps): update composer:latest docker digest to 68e926a (#154)

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

Author: renovate[bot]

Dockerfile

@@ -5,7 +5,7 @@ LABEL org.opencontainers.image.description="php-docker-api-client app syncs you
 LABEL org.opencontainers.image.licenses=MIT
 ENV COMPOSER_ALLOW_SUPERUSER=1
 
-COPY --from=composer:latest@sha256:d013f2c06509ff0a06342f67a7fc062deebda2c36e17b415b035f1299dcd181e /usr/bin/composer /usr/local/bin/composer
+COPY --from=composer:latest@sha256:68e926a477000f12e8645e82a020b84904d49071c895c4951551fe80eed5d103 /usr/bin/composer /usr/local/bin/composer
 
 WORKDIR /app
 COPY --link . /app