Update secp256k1 to 0.7.1 (#36)

The latest secp256k1 release, 0.7.1, contains bug fixes that we may
benefit from, see
[CHANGELOG.md](https://github.com/bitcoin-core/secp256k1/blob/master/CHANGELOG.md).

Author: bthomee

.github/workflows/export.yml

@@ -41,7 +41,7 @@ jobs:
           conan export m4/all --version=1.4.19
           conan export nudb/all --version=2.0.9
           conan export openssl/3.x.x --version=3.5.4
-          conan export secp256k1/all --version=0.7.0
+          conan export secp256k1/all --version=0.7.1
           conan export snappy/all --version=1.1.10
           conan export soci/all --version=4.0.3
           conan export wasmi/all --version=1.0.6

recipes/secp256k1/all/conandata.yml

@@ -1,4 +1,7 @@
 sources:
+  "0.7.1":
+    url: https://github.com/bitcoin-core/secp256k1/archive/refs/tags/v0.7.1.tar.gz
+    sha256: 958f204dbafc117e73a2604285dc2eb2a5128344d3499c114dcba5de54cb7a9e
   "0.7.0":
     url: https://github.com/bitcoin-core/secp256k1/archive/refs/tags/v0.7.0.tar.gz
     sha256: 073d19064f3600014750d6949b31a0c957aa7b98920fb4aaa495be07e8e7cd00

recipes/secp256k1/config.yml

@@ -1,3 +1,5 @@
 versions:
+  "0.7.1":
+    folder: all
   "0.7.0":
     folder: all