Update public.ecr.aws/docker/library/composer Docker tag to v2.6.6

This MR contains the following updates:

Package	Type	Update	Change
public.ecr.aws/docker/library/composer	stage	patch	2.6.5 -> 2.6.6

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Dockerfile

@@ -4,7 +4,7 @@ COPY . ./
 RUN yarn install --frozen-lockfile && \
     yarn build
 
-FROM --platform=$BUILDPLATFORM public.ecr.aws/docker/library/composer:2.6.5@sha256:67f1bec07666f688791bff2c13b34b9c35042cc4c1e42fbb5bd4dbe4ae70f0fb AS buildPHP
+FROM --platform=$BUILDPLATFORM public.ecr.aws/docker/library/composer:2.6.6@sha256:4c1d9cef880bb49d99bf9dc2b13440c37d5b16a31395289282ae3c5f79bf48ef AS buildPHP
 WORKDIR /app
 COPY . ./
 RUN composer install --no-cache --no-interaction --prefer-dist --ignore-platform-reqs --optimize-autoloader