Use `/run` over `/var/run`

Systemd deprecated `/var/run` back in 2018 at least[1].  Switch paths
from `/var/run` to `/run`.  This will give us protection for an upcoming
systemd removing the `/var/run` symlink.

[1]: https://github.com/systemd/systemd/blame/db4b4e0cd364ec58db72f3f2fb992b2ce8244b3b/man/tmpfiles.d.xml#L889

Fixes: 8c974f76411c ("ipmid: Switch to /var/run for lockfiles")
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Icb4a0897202b57ba3856c280dd637c1383819bd4
diff --git a/user_channel/channel_mgmt.hpp b/user_channel/channel_mgmt.hpp
index f27673b..5ec5a16 100644
--- a/user_channel/channel_mgmt.hpp
+++ b/user_channel/channel_mgmt.hpp
@@ -38,7 +38,7 @@
 
 static constexpr const char* ipmiChannelMutex = "ipmi_channel_mutex";
 static constexpr const char* ipmiChMutexCleanupLockFile =
-    "/var/run/ipmi/ipmi_channel_mutex_cleanup";
+    "/run/ipmi/ipmi_channel_mutex_cleanup";
 
 /** @struct ChannelAccessData
  *