Raise required compiler to Rust 1.75

On older compilers, the pointer cast does not compile due to a rustc bug.

    error[E0310]: the parameter type `T` may not live long enough
       --> src/lib.rs:223:12
        |
    223 |         &*(&phantom_data as *const dyn NonStaticAny as *const (dyn NonStaticAny + 'static))
        |            ^^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
        |
    help: consider adding an explicit lifetime bound...
        |
    203 |     T: ?Sized + 'static,
        |               +++++++++

.github/workflows/ci.yml

@@ -44,7 +44,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        rust: [stable, 1.61.0, 1.34.0]
+        rust: [stable, 1.75.0]
     timeout-minutes: 45
     steps:
       - uses: actions/checkout@v4

Cargo.toml

@@ -8,7 +8,7 @@ documentation = "https://docs.rs/typeid"
 edition = "2018"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/dtolnay/typeid"
-rust-version = "1.34"
+rust-version = "1.75"
 
 [package.metadata.docs.rs]
 targets = ["x86_64-unknown-linux-gnu"]