delete hirsute submodule directory entry

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

diff --git a/submodules/ubuntu-hirsute b/submodules/ubuntu-hirsute
deleted file mode 160000 (submodule)
index 9fb3242..0000000
--- a/submodules/ubuntu-hirsute
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 9fb3242fa6a38d072949cbaa9183f65d56675231