Bump composer from 921a1fb to 6d2b538

Bumps composer from `921a1fb` to `6d2b538`.

---
updated-dependencies:
- dependency-name: composer
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Dockerfile

@@ -1,5 +1,5 @@
 # -----------------
-FROM composer:2.7.7@sha256:921a1fbb87686cb8b165b7b7358da126f71af59c48b6636398d7e09b8ed5302e AS build-env
+FROM composer:2.7.7@sha256:6d2b5386580c3ba67399c6ccfb50873146d68fcd7c31549f8802781559bed709 AS build-env
 
 COPY . /opt/ghsec-jira/