Bump composer from 1084a45 to 921a1fb

Bumps composer from `1084a45` to `921a1fb`.

---
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@sha256:1084a450042b6b6ca0f30a5bdd95430078e24ff7797c4168e5f8844c9628322b AS build-env
+FROM composer:2.7.7@sha256:921a1fbb87686cb8b165b7b7358da126f71af59c48b6636398d7e09b8ed5302e AS build-env
 
 COPY . /opt/ghsec-jira/