Fix ci breaking due to new dependencies and rustc changes (backport to master) (#163)

Applies the same fixes that was applied to `color-eyre-0.6` to master,
namely the new update to `trybuild` that breaks our MSRV requirement,
requiring us to pin the version, as the dependency only bumped the patch
version for the updated MRSV.

It also fixes the theme test breaking on windows due to new
*before-main* machinery on windows affecting the backtrace. This is
fixed by filtering out the functions before and including main(due to no
take_until iter adapter in std), but still includes the panicking
function call.

There are currently three branches that need/needed this fix

- master: containing latest breaking code for 1.0
- color-eyre-0.6
- release-0.6 (does not include the theme test change as color-eyre is
not present there)

color-eyre/tests/theme.rs

@@ -124,6 +124,8 @@ fn test_panic_backwards_compatibility() {
         .args(["run", "--example", "theme_test_helper"])
         .arg("--no-default-features")
         .args(&features)
+        .env("RUSTFLAGS", "-Awarnings")
+        .env("CARGO_FUTURE_INCOMPAT_REPORT_FREQUENCY", "never")
         .output()
         .expect("failed to execute process");
     let target = String::from_utf8(output.stderr).expect("failed to convert output to `String`");
@@ -168,7 +170,7 @@ fn test_backwards_compatibility(target: String, file_name: &str) {
     fn normalize_backtrace(input: &str) -> String {
         input
             .lines()
-            .take_while(|v| !v.contains("core::panic"))
+            .take_while(|v| !v.contains("core::panic") && !v.contains("theme_test_helper::main"))
             .collect::<Vec<_>>()
             .join("\n")
     }

eyre/Cargo.toml

@@ -27,7 +27,7 @@ pyo3 = { version = "0.20", optional = true, default-features = false }
 futures = { version = "0.3", default-features = false }
 rustversion = "1.0"
 thiserror = "1.0"
-trybuild = { version = "1.0.19", features = ["diff"] }
+trybuild = { version = "=1.0.83", features = ["diff"] }
 backtrace = "0.3.46"
 anyhow = "1.0.28"
 syn = { version = "2.0", features = ["full"] }