rpm: depend on java-11-headless

Motivation:
As dCache is not a desktop application java-11-headless is sufficient.

Result:
less GUI related dependencies installed as transient dependency with
dCache package.

Fixes: #7249
Acked-by: Lea Morschel
Target: master, 9.1
Require-book: no
Require-notes: yes
(cherry picked from commit 0edcfb1)
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>

packages/fhs/src/main/rpm/dcache-server.spec

@@ -11,7 +11,7 @@ AutoReqProv: no
 
 Requires(pre): shadow-utils
 Requires: which
-Requires: java-11
+Requires: java-11-headless
 
 %{?systemd_requires}
 BuildRequires: systemd