update ol2 version

Makefile

@@ -42,7 +42,7 @@ export ROOTLESS
 ifeq ($(PDK),sky130A)
 	SKYWATER_COMMIT=f70d8ca46961ff92719d8870a18a076370b85f6c
 	export OPEN_PDKS_COMMIT?=78b7bc32ddb4b6f14f76883c2e2dc5b5de9d1cbc
-	export OPENLANE_TAG?=2.0.0-b5
+	export OPENLANE_TAG?=2.0.0-b6
 	MPW_TAG ?= mpw-9d
 
 ifeq ($(CARAVEL_LITE),1)
@@ -60,7 +60,7 @@ endif
 ifeq ($(PDK),sky130B)
 	SKYWATER_COMMIT=f70d8ca46961ff92719d8870a18a076370b85f6c
 	export OPEN_PDKS_COMMIT?=78b7bc32ddb4b6f14f76883c2e2dc5b5de9d1cbc
-	export OPENLANE_TAG?=2.0.0-b5
+	export OPENLANE_TAG?=2.0.0-b6
 	MPW_TAG ?= mpw-9d
 
 ifeq ($(CARAVEL_LITE),1)
@@ -82,7 +82,7 @@ ifeq ($(PDK),gf180mcuC)
 	CARAVEL_REPO := https://github.com/efabless/caravel-gf180mcu
 	CARAVEL_TAG := $(MPW_TAG)
 	export OPEN_PDKS_COMMIT?=e6f9c8876da77220403014b116761b0b2d79aab4
-	export OPENLANE_TAG?=2.0.0-b5
+	export OPENLANE_TAG?=2.0.0-b6
 
 endif
 
@@ -194,7 +194,6 @@ OPENLANE_TAG_DOCKER=$(subst -,,$(OPENLANE_TAG))
 openlane-docker-container:
 	docker pull ghcr.io/efabless/openlane2:$(OPENLANE_TAG_DOCKER)
 
-.PHONY: openlane-venv
 openlane-venv: openlane-venv/manifest.txt
 openlane-venv/manifest.txt:
 	rm -rf openlane-venv