fix: update pinned package versions in Dockerfile

Debian trixie updated grub and file packages, breaking the build.
Updated versions:
- grub-pc-bin: 2.12-9 → 2.12-9+deb13u1
- grub-efi-amd64-bin: 2.12-9 → 2.12-9+deb13u1
- grub-efi-ia32-bin: 2.12-9 → 2.12-9+deb13u1
- file: 1:5.46-2 → 1:5.46-5

💘 Generated with Crush

Assisted-by: GLM-4.7 via Crush <crush@charm.land>

Dockerfile

@@ -31,14 +31,14 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     debootstrap=1.0.141 \
     squashfs-tools=1:4.6.1-1 \
     xorriso=1.5.6-1.2+b1 \
-    grub-pc-bin=2.12-9 \
-    grub-efi-amd64-bin=2.12-9 \
-    grub-efi-ia32-bin=2.12-9 \
+    grub-pc-bin=2.12-9+deb13u1 \
+    grub-efi-amd64-bin=2.12-9+deb13u1 \
+    grub-efi-ia32-bin=2.12-9+deb13u1 \
     mtools=4.0.48-1 \
     dosfstools=4.2-1.2 \
     syslinux-utils=3:6.04~git20190206.bf6db5b4+dfsg1-3.1 \
     isolinux=3:6.04~git20190206.bf6db5b4+dfsg1-3.1 \
-    file=1:5.46-2 \
+    file=1:5.46-5 \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*