secp: move git module ref to the new official github repo

jgriffiths · jgriffiths · commit 4a369b045519 · 2024-10-21T14:08:05.000+13:00
diff --git a/.gitmodules b/.gitmodules
@@ -1,3 +1,3 @@
 [submodule "src/secp256k1"]
 	path = src/secp256k1
-	url = https://github.com/ElementsProject/secp256k1-zkp.git
+	url = https://github.com/BlockstreamResearch/secp256k1-zkp.git
