Merge #1222

1222: build(deps): bump ecdsa_fun from `7f1ae3d` to `da6ffd2` r=delta1 a=dependabot[bot]

Bumps [ecdsa_fun](https://github.com/LLFourn/secp256kfun) from `7f1ae3d` to `da6ffd2`.
<details>
<summary>Commits</summary>
<ul>
<li><a href="da6ffd2ef4"><code>da6ffd2</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/LLFourn/secp256kfun/issues/132">#132</a> from LLFourn/clean_up_feature_falgs</li>
<li><a href="147896ac92"><code>147896a</code></a> Add feature flag docs</li>
<li><a href="5c01ec45ec"><code>5c01ec4</code></a> Use v1.60 cargo features to clean up dependencies</li>
<li><a href="026aaa8e24"><code>026aaa8</code></a> Clean up feature flags</li>
<li><a href="e041ac0811"><code>e041ac0</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/LLFourn/secp256kfun/issues/133">#133</a> from delta1/secp256k1-0.24</li>
<li><a href="b666877ce0"><code>b666877</code></a> build(deps): update to secp256k1 0.24</li>
<li>See full diff in <a href="7f1ae3db39...da6ffd2ef4">compare view</a></li>
</ul>
</details>
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Cargo.lock

@@ -958,12 +958,11 @@ checksum = "5caaa75cbd2b960ff1e5392d2cfb1f44717fffe12fc1f32b7b5d1267f99732a6"
 [[package]]
 name = "ecdsa_fun"
 version = "0.7.1"
-source = "git+https://github.com/LLFourn/secp256kfun#e041ac08117e30170ac418047ecb734652e6b62c"
+source = "git+https://github.com/LLFourn/secp256kfun#da6ffd2ef4d58c84d508428356c92d92d5f11ac4"
 dependencies = [
  "bincode",
  "rand_chacha 0.3.1",
  "secp256kfun",
- "serde",
  "sigma_fun",
 ]
 
@@ -3273,7 +3272,7 @@ dependencies = [
 [[package]]
 name = "secp256kfun"
 version = "0.7.1"
-source = "git+https://github.com/LLFourn/secp256kfun#e041ac08117e30170ac418047ecb734652e6b62c"
+source = "git+https://github.com/LLFourn/secp256kfun#da6ffd2ef4d58c84d508428356c92d92d5f11ac4"
 dependencies = [
  "digest 0.10.5",
  "rand_core 0.6.2",
@@ -3470,7 +3469,7 @@ dependencies = [
 [[package]]
 name = "sigma_fun"
 version = "0.4.1"
-source = "git+https://github.com/LLFourn/secp256kfun#e041ac08117e30170ac418047ecb734652e6b62c"
+source = "git+https://github.com/LLFourn/secp256kfun#da6ffd2ef4d58c84d508428356c92d92d5f11ac4"
 dependencies = [
  "curve25519-dalek-ng",
  "digest 0.10.5",