chore(deps): update composer:latest docker digest to 8f3b7d9

Signed-off-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:ea704a565cd41c2c6f6910def509cb8944096a81e4a46cb02f827063c216363f /usr/bin/composer /usr/local/bin/composer
+COPY --from=composer:latest@sha256:8f3b7d97cd7436dae41d6af0dd6a53853779040ecac26e65544fc31746035705 /usr/bin/composer /usr/local/bin/composer
 
 WORKDIR /app
 COPY --link . /app