[#569] Fix Dockerfile to correctly build backend module

The deployment of the project was failing due to a bug in the Dockerfile
of the backend module, caused by a change in the GHC version. The issue
was identified during the build process, as the executable path had
changed, preventing successful building of the backend module.

Changes made in this commit:
- Updated the Dockerfile for the backend module to reflect the correct
  GHC version (9.2.7) and executable path.

govtool/backend/Dockerfile

@@ -3,4 +3,4 @@ FROM 733019650473.dkr.ecr.eu-west-1.amazonaws.com/backend-base:$BASE_IMAGE_TAG
 WORKDIR /src
 COPY . .
 RUN cabal build
-RUN cp dist-newstyle/build/x86_64-linux/ghc-9.2.8/vva-be-0.1.0.0/x/vva-be/build/vva-be/vva-be /usr/local/bin
+RUN cp dist-newstyle/build/x86_64-linux/ghc-9.2.7/vva-be-0.1.0.0/x/vva-be/build/vva-be/vva-be /usr/local/bin