Upgrade secp256k1 to stable release

This also removes the dependency on gmp

.github/scripts/install-libsecp256k1.sh

@@ -9,7 +9,7 @@ if [ -f $HOME/.local/lib/libsecp256k1.a ]; then
   exit 0
 fi
 
-gitRef="1086fda4c1975d0cad8d3cad96794a64ec12dca4"
+gitRef="21ffe4b22a9683cf24ae0763359e401d1284cc7a"
 curl -LO "https://github.com/bitcoin-core/secp256k1/archive/$gitRef.zip"
 
 unzip "$gitRef.zip"
@@ -18,6 +18,6 @@ cd "secp256k1-$gitRef"
 ./autogen.sh
 # hevm needs reecovery module
 # enable pic so static library can link against dynamic correctly
-./configure --prefix=$PREFIX --enable-module-recovery --with-pic
+./configure --prefix=$PREFIX --enable-module-recovery --disable-benchmark --disable-tests --with-pic
 
 make install