Add rust-version = 1.77 to Cargo.toml

Since we know what the lowest Rust version is

.github/workflows/ci.yml

@@ -68,7 +68,8 @@ jobs:
             rust: nightly
           - os: ubuntu-latest
             # MSRV. Not considered breaking when this has to be bumped.
-            rust: 1.70.0
+            # But update `rust-version` in `Cargo.toml`
+            rust: 1.77.0
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2

Cargo.toml

@@ -6,6 +6,7 @@ license = "MIT OR Apache-2.0"
 description = "Tunnel UDP traffic inside a TCP stream. Each datagram is prefixed with a 16 bit unsigned integer containing the length"
 repository = "https://github.com/mullvad/udp-over-tcp"
 edition = "2021"
+rust-version = "1.77.0"
 publish = false
 
 [[bin]]