image: increase image installer rootfs to 5 GiB

The packages we're installing for Anaconda are larger than 4 GiB (the
size of the LiveOS image) on Fedora 39 aarch64.  The size increase isn't
huge, checking the size of the packages, it goes from 3880533484 to
3974938171 bytes, but it's enough to tip it over the threshold of a 4
GiB partition.

Increasing the size for all LiveOS images on the image installers to 5
GiB to avoid further issues.  After compression, the increase should
have a negligible (if any) effect on the size of the ISO.

pkg/image/anaconda_tar_installer.go

@@ -121,7 +121,7 @@ func (img *AnacondaTarInstaller) InstantiateManifest(m *manifest.Manifest,
 	isoLabel := fmt.Sprintf(img.ISOLabelTempl, img.Platform.GetArch())
 
 	rootfsImagePipeline := manifest.NewISORootfsImg(buildPipeline, anacondaPipeline)
-	rootfsImagePipeline.Size = 4 * common.GibiByte
+	rootfsImagePipeline.Size = 5 * common.GibiByte
 
 	bootTreePipeline := manifest.NewEFIBootTree(buildPipeline, img.Product, img.OSVersion)
 	bootTreePipeline.Platform = img.Platform