Updated references, mainly to pick up corrections made to the
sky130 standard cell libraries (at least HDLL was changed today;
other updated might have been reflected in the references
already).

gf180mcu/gf180mcu.json

diff --git a/gf180mcu/gf180mcu.json b/gf180mcu/gf180mcu.json
index 68f53d2..d0d3f29 100644
--- a/gf180mcu/gf180mcu.json
+++ b/gf180mcu/gf180mcu.json
@@ -96,7 +96,7 @@
         "magic": "MAGIC_COMMIT"
     },
     "reference": {
-        "open_pdks": "bb56b62f00efee618141e8373b7ebad721a3b45b",
+        "open_pdks": "fa87e57d4af3c4cab5addbf14d5172bdce90e6c4",
         "magic": "67c6ed939514e537773f9f01cc2ecca5c3400c44",
         "gf180mcu_pdk": "a897aa30369d3bcec87d9d50ce9b01f320f854ef",
         "gf180mcu_fd_pr": "216e518bf74c8bbcce31ba06802000de998fe3f0",

sky130/sky130.json

diff --git a/sky130/sky130.json b/sky130/sky130.json
index 76f11a2..6b1609b 100644
--- a/sky130/sky130.json
+++ b/sky130/sky130.json
@@ -94,7 +94,7 @@
         "magic": "MAGIC_COMMIT"
     },
     "reference": {
-        "open_pdks": "bb56b62f00efee618141e8373b7ebad721a3b45b",
+        "open_pdks": "fa87e57d4af3c4cab5addbf14d5172bdce90e6c4",
         "magic": "67c6ed939514e537773f9f01cc2ecca5c3400c44",
         "sky130_fd_pr": "403964dc7f9cca5ec1a8cc7b4f2a6f532b781676",
         "sky130_fd_io": "b0c377d9c91b4152e0edd3a766a19185df819888",
@@ -103,7 +103,7 @@
         "sky130_fd_sc_ls": "4283919deb7eb4ed195c2b6e95431a812491f6d0",
         "sky130_fd_sc_lp": "b93a1a75fa1b864872ebb0b078f6a2dd6e318d7c",
         "sky130_fd_sc_hd": "9cb2d7cb8ed4619094263614039a61b6b2d22a88",
-        "sky130_fd_sc_hdll": "f67521458137f30a01ec76aad3028e77581446ae",
+        "sky130_fd_sc_hdll": "3c6fd57c45114a0307dfff32b310f5995be41cf7",
         "sky130_fd_sc_hvl": "e5413e01fa071029ba84d9faa98d9acd80e75a38",
         "sky130_osu_sc_t12": "ac90ef0c622a9377a16b5218d9da3ac4169eeaaf",
         "sky130_osu_sc_t15": "95d1c19abb47e1b2945847acb4e817b1b8417c43",