Bump backtrace-rs (#175)

0.3.59 is the first version of backtrace-rs that doesn't use
`gimli-symbolize`:
rust-lang/backtrace-rs@5fc4f79

While the feature is still there, it is unused and later on removed in
rust-lang/backtrace-rs@4cbe6b6.
Original [PR #615](rust-lang/backtrace-rs#615)

Closes #174

color-eyre/Cargo.toml

@@ -20,7 +20,7 @@ track-caller = []
 [dependencies]
 eyre = "0.6.1"
 tracing-error = { version = "0.2.0", optional = true }
-backtrace = { version = "0.3.48", features = ["gimli-symbolize"] }
+backtrace = { version = "0.3.59" }
 indenter = { workspace = true }
 owo-colors = { workspace = true }
 color-spantrace = { version = "0.2", path = "../color-spantrace", optional = true }