Bump libsecp256k1 from 0.6.0 to 0.7.0

Bumps [libsecp256k1](https://github.com/paritytech/libsecp256k1) from 0.6.0 to 0.7.0.
- [Release notes](https://github.com/paritytech/libsecp256k1/releases)
- [Changelog](https://github.com/paritytech/libsecp256k1/blob/master/CHANGELOG.md)
- [Commits](https://github.com/paritytech/libsecp256k1/commits)

---
updated-dependencies:
- dependency-name: libsecp256k1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

runtime/common/Cargo.toml

@@ -45,7 +45,7 @@ frame-benchmarking = { git = "https://github.com/paritytech/substrate", branch =
 pallet-babe = { git = "https://github.com/paritytech/substrate", branch = "master", default-features = false, optional = true }
 
 primitives = { package = "polkadot-primitives", path = "../../primitives", default-features = false }
-libsecp256k1 = { version = "0.6.0", default-features = false }
+libsecp256k1 = { version = "0.7.0", default-features = false }
 runtime-parachains = { package = "polkadot-runtime-parachains", path = "../parachains", default-features = false }
 
 slot-range-helper = { path = "slot_range_helper", default-features = false }
@@ -58,7 +58,7 @@ pallet-babe = { git = "https://github.com/paritytech/substrate", branch = "maste
 pallet-treasury = { git = "https://github.com/paritytech/substrate", branch = "master" }
 sp-keystore = { git = "https://github.com/paritytech/substrate", branch = "master" }
 serde_json = "1.0.67"
-libsecp256k1 = "0.6.0"
+libsecp256k1 = "0.7.0"
 
 [features]
 default = ["std"]