Update bitcoin requirement from 0.30.1 to 0.31.1

Updates the requirements on [bitcoin](https://github.com/rust-bitcoin/rust-bitcoin) to permit the latest version.
- [Release notes](https://github.com/rust-bitcoin/rust-bitcoin/releases)
- [Commits](https://github.com/rust-bitcoin/rust-bitcoin/commits/bitcoin-0.31.1)

---
updated-dependencies:
- dependency-name: bitcoin
  dependency-type: direct:production
...

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

chameleon/Cargo.toml

@@ -8,6 +8,6 @@ graphql = { path = "../graphql" }
 honey-badger = { path = "../honey-badger" }
 
 [dev-dependencies]
-bitcoin = { version = "0.30.1" }
+bitcoin = { version = "0.31.1" }
 ctor = "0.2.0"
 simplelog = { version ="0.12.0", features = ["test"] }

crow/Cargo.toml

@@ -10,4 +10,4 @@ isocountry = { version = "0.3.2" }
 isolanguage-1 = { version = "0.2.2" }
 
 [dev-dependencies]
-bitcoin = { version = "0.30.1" }
+bitcoin = { version = "0.31.1" }

squirrel/Cargo.toml

@@ -11,7 +11,7 @@ honey-badger = { path = "../honey-badger" }
 bdk = { version = "0.29.0", features = ["keys-bip39"] }
 
 [dev-dependencies]
-bitcoin = { version = "0.29.2" }
+bitcoin = { version = "0.31.1" }
 ctor = "0.2.0"
 rand = "0.8.5"
 simplelog = { version ="0.12.0", features = ["test"] }