Fix Containerfile to use Fedora 43 for Vale Copr repository

The base image now uses Fedora 43, but the Containerfile was still
referencing fedora-40-x86_64 for the Vale Copr repository, which is
no longer available. Updated to use fedora-43-x86_64 instead.

Error:
  Chroot not found in the given Copr project (fedora-40-x86_64).

Fix:
  Changed from fedora-40-x86_64 to fedora-43-x86_64

Author: gtrivedi88

Containerfile

@@ -36,7 +36,7 @@ LABEL \
 # Install system packages
 RUN set -x \
     && dnf install --assumeyes --quiet dnf-plugins-core \
-    && dnf copr enable --assumeyes --quiet mczernek/vale fedora-40-x86_64 \
+    && dnf copr enable --assumeyes --quiet mczernek/vale fedora-43-x86_64 \
     && dnf install --assumeyes --quiet \
     ShellCheck \
     bash \