proj: MSRV 1.61 -> 1.63

We're seeing more of our deps move to this MSRV or higher and it's
shipped in Debian stable. Time to move our MSRV to 1.63.

.github/workflows/ci.yml

@@ -240,7 +240,7 @@ jobs:
       - name: Install toolchain
         uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: "1.61"
+          toolchain: "1.63"
       - run: cargo check --locked --lib --all-features
 
   cross:

Cargo.toml

@@ -16,7 +16,7 @@
 categories = ["cryptography", "no-std"]
 description = "Web PKI X.509 Certificate Verification."
 edition = "2021"
-rust-version = "1.61"
+rust-version = "1.63"
 license = "ISC"
 name = "rustls-webpki"
 readme = "README.md"