Updated references after applying Sylvain Munaut's fix for the
NPC (nitride poly cut) layer in the HD standard cell library
conb_1 and and2_0 cells, and my fix to a deep nwell layer in
the SIO macro cell in the I/O library.

VERSION

diff --git a/VERSION b/VERSION
index cdf6f00..12b90de 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.493
+1.0.494

gf180mcu/gf180mcu.json

diff --git a/gf180mcu/gf180mcu.json b/gf180mcu/gf180mcu.json
index b22e358..e8ecd00 100644
--- a/gf180mcu/gf180mcu.json
+++ b/gf180mcu/gf180mcu.json
@@ -89,8 +89,8 @@
         "magic": "MAGIC_COMMIT"
     },
     "reference": {
-        "open_pdks": "47df1178431cb04f57eb6600e64750ae2a7b6364",
-        "magic": "0c36365db8921397a258abbea0369cee8d560c99",
+        "open_pdks": "0fe599b2afb6708d281543108caf8310912f54af",
+        "magic": "974621ebe7fd023721332479ab6c64dfcf357aa2",
         "gf180mcu_pdk": "a897aa30369d3bcec87d9d50ce9b01f320f854ef",
         "gf180mcu_fd_pr": "a11222d681f2134ab28e97f97b9b99b6af188f88",
         "gf180mcu_fd_pv": "e9410df04da5b64a1053aa6e5180dc144b8a12a2",

sky130/sky130.json

diff --git a/sky130/sky130.json b/sky130/sky130.json
index 4f68400..751225c 100644
--- a/sky130/sky130.json
+++ b/sky130/sky130.json
@@ -94,15 +94,15 @@
         "magic": "MAGIC_COMMIT"
     },
     "reference": {
-        "open_pdks": "47df1178431cb04f57eb6600e64750ae2a7b6364",
-        "magic": "0c36365db8921397a258abbea0369cee8d560c99",
+        "open_pdks": "0fe599b2afb6708d281543108caf8310912f54af",
+        "magic": "974621ebe7fd023721332479ab6c64dfcf357aa2",
         "sky130_fd_pr": "afc63d29f811b65b9888b2133fd3348eefc92046",
-        "sky130_fd_io": "3abef97503c37e5e68f450059f51eee308432b0b",
+        "sky130_fd_io": "d3b662d017ce4fb5d4e3c3922ac81f744111e010",
         "sky130_fd_sc_hs": "9a855e97aa75f8a14be7eadc365c28d50045d5fc",
         "sky130_fd_sc_ms": "26d0047c0e2dbe28fe4950f171411f6e8b3d0564",
         "sky130_fd_sc_ls": "8e7040bfc58a17386e3d900c0e3b9c9163545c4a",
         "sky130_fd_sc_lp": "b93a1a75fa1b864872ebb0b078f6a2dd6e318d7c",
-        "sky130_fd_sc_hd": "2a8fc299668dd3f225a67676d5d9c140bd6483a3",
+        "sky130_fd_sc_hd": "4dbe3954e308edb6d65a15d1683ddca6eabdc369",
         "sky130_fd_sc_hdll": "d48faa83ef2d8573d85384c4eb019ab78295db0b",
         "sky130_fd_sc_hvl": "5f544a6d5b9385ac563811e7a455b050eea5fb70",
         "sky130_osu_sc_t12": "ac90ef0c622a9377a16b5218d9da3ac4169eeaaf",