Get rid of is-terminal dependency as our MSRV is already > v1.70

Author: SpriteOvO

spdlog/Cargo.toml

@@ -55,7 +55,6 @@ crossbeam = { version = "0.8.2", optional = true }
 dyn-clone = "1.0.14"
 env_filter = { version = "0.1.0", optional = true }
 flexible-string = { version = "0.1.0", optional = true }
-is-terminal = "0.4"
 log = { version = "0.4.21", optional = true, features = ["kv"] }
 once_cell = "1.16.0"
 parking_lot = "0.12.0"

spdlog/src/sink/std_stream_sink.rs

@@ -2,7 +2,7 @@
 
 use std::{
     convert::Infallible,
-    io::{self, Write},
+    io::{self, IsTerminal as _, Write},
     // Import `str` module for function `std::str::from_utf8`, because method `str::from_utf8` is
     // stabilized since Rust 1.87.
     //
@@ -188,7 +188,6 @@ impl StdStreamSink {
 
     #[must_use]
     fn should_render_style(style_mode: StyleMode, stream: StdStream) -> bool {
-        use is_terminal::IsTerminal;
         let is_terminal = match stream {
             StdStream::Stdout => io::stdout().is_terminal(),
             StdStream::Stderr => io::stderr().is_terminal(),