treewide: bump to bazel 8

Change-Id: I18b6b4a5893167d722bb6270f11da1814c1664e3
Reviewed-on: https://review.monogon.dev/c/monogon/+/3963
Tested-by: Jenkins CI
Reviewed-by: Leopold Schabel <leo@monogon.tech>
diff --git a/.bazelrc.sandboxroot b/.bazelrc.sandboxroot
index db12cfd..dcefa26 100644
--- a/.bazelrc.sandboxroot
+++ b/.bazelrc.sandboxroot
@@ -4,6 +4,9 @@
 build --incompatible_strict_action_env=true
 build --action_env=BAZEL_DO_NOT_DETECT_CPP_TOOLCHAIN=1
 
+# We still require WORKSPACE support as bazeldnf isn't bzlmod compatible yet.
+common --enable_workspace
+
 # No host CC platform - we only want pure Go for the sandboxroot
 build --host_platform=@io_bazel_rules_go//go/toolchain:linux_amd64