kea: depend on the concrete log4cplus, not the -any virtual

Commit 1ea43c352 ("kea: fix kea-libs dependencies") replaced the
direct +log4cplus dependency on kea-libs with the virtual name
+log4cplus-any. With only one log4cplus implementation in the feed,
nothing actually PROVIDES log4cplus-any other than the auto-generated
"package name + -any" alias on log4cplus itself.

apk treats `-any`-suffixed names as ambiguous virtuals that the
admin must resolve explicitly, even when only one provider exists,
and refuses to install:

  ERROR: unable to select packages:
    log4cplus-any (virtual):
      note: please select one of the 'provided by'
            packages explicitly
      provided by: log4cplus
      required by: kea-libs-3.0.2-r7[log4cplus-any]

That bubbles up to every kea subpackage runtime test in CI
(kea-admin, kea-ctrl, every kea-dhcp* and kea-hook-*) and fails
the multi-arch test build with exit code 3.

Switch back to +log4cplus directly; the +libstdcpp addition from
that earlier commit stays — it was the genuinely useful part of
the change. Bump PKG_RELEASE for the redo.

Signed-off-by: Alexandru Ardelean <alex@shruggie.ro>

net/kea/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=kea
 PKG_VERSION:=3.0.2
-PKG_RELEASE:=7
+PKG_RELEASE:=8
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=https://ftp.isc.org/isc/kea/$(PKG_VERSION)
@@ -63,7 +63,7 @@ endef
 define Package/kea-libs
 	$(call Package/kea/Default)
 	TITLE+=Libraries
-	DEPENDS:=+libopenssl +libstdcpp +log4cplus-any +boost
+	DEPENDS:=+libopenssl +libstdcpp +log4cplus +boost
 endef
 define Package/kea-libs/description
 		Kea required Libraries.