build: move back to stable rust toolchain

We just need rust nightly for formatting, so let's use it for just that.

Author: SimonThormeyer

crypto-ffi/Cargo.toml

@@ -6,7 +6,6 @@ version = "9.0.1"
 edition = "2024"
 license = "GPL-3.0-only"
 publish = false
-rust-version = "1.91.1"
 
 [lib]
 name = "core_crypto_ffi"

crypto-macros/Cargo.toml

@@ -5,7 +5,6 @@ repository = "https://github.com/wireapp/core-crypto"
 version = "9.0.1"
 edition = "2024"
 license = "GPL-3.0-only"
-rust-version = "1.91.1"
 
 [lib]
 proc-macro = true

crypto/Cargo.toml

@@ -6,7 +6,6 @@ version = "9.0.1"
 edition = "2024"
 license = "GPL-3.0-only"
 publish = false
-rust-version = "1.91.1"
 
 [lib]
 name = "core_crypto"

decode/Cargo.toml

@@ -3,7 +3,6 @@ name = "decode"
 version = "0.1.0"
 edition = "2024"
 license = "GPL-3.0-only"
-rust-version = "1.91.1"
 
 [lints]
 workspace = true

interop/Cargo.toml

@@ -3,7 +3,6 @@ name = "interop"
 version = "9.0.1"
 edition = "2024"
 license = "GPL-3.0-only"
-rust-version = "1.91.1"
 
 [features]
 default = ["proteus"]

keystore-dump/Cargo.toml

@@ -4,7 +4,6 @@ description = "Dumps a keystore to JSON on stdout"
 version = "9.0.1"
 edition = "2024"
 license = "GPL-3.0-only"
-rust-version = "1.91.1"
 
 [lints]
 workspace = true

keystore/Cargo.toml

@@ -6,7 +6,6 @@ version = "9.0.1"
 edition = "2024"
 license = "GPL-3.0-only"
 publish = false
-rust-version = "1.91.1"
 
 [lib]
 name = "core_crypto_keystore"

mls-provider/Cargo.toml

@@ -6,7 +6,6 @@ version = "9.0.1"
 edition = "2024"
 license = "GPL-3.0-only"
 publish = false
-rust-version = "1.91.1"
 
 [lib]
 name = "mls_crypto_provider"

obfuscate/Cargo.toml

@@ -2,7 +2,6 @@
 name = "obfuscate"
 version = "0.1.0"
 edition = "2024"
-rust-version = "1.91.1"
 
 [dependencies]
 derive_more.workspace = true

rust-toolchain.toml

@@ -1,5 +1,5 @@
 [toolchain]
-channel = "nightly-2025-11-25"
+channel = "1.91.1"
 components = [
   "rust-analyzer",
   "cargo",