chore(deps): update composer:latest docker digest to 31d5335 (#168)

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@sha256:68e926a477000f12e8645e82a020b84904d49071c895c4951551fe80eed5d103 /usr/bin/composer /usr/local/bin/composer
+COPY --from=composer:latest@sha256:31d53352a469542e22f12c7a4648670e60cc9c8b3c8fc5d787bf4952524a2291 /usr/bin/composer /usr/local/bin/composer
 
 WORKDIR /app
 COPY --link . /app