Update Relx to v3.27.0

plugins/relx.mk

@@ -8,7 +8,7 @@
 RELX ?= $(ERLANG_MK_TMP)/relx
 RELX_CONFIG ?= $(CURDIR)/relx.config
 
-RELX_URL ?= https://erlang.mk/res/relx-v3.26.0
+RELX_URL ?= https://erlang.mk/res/relx-v3.27.0
 RELX_OPTS ?=
 RELX_OUTPUT_DIR ?= _rel
 RELX_REL_EXT ?=