Update default runner to Ubuntu 24.04

cargo-dist/src/backend/ci/github.rs

@@ -638,7 +638,7 @@ pub fn runner_to_config(runner: &GithubRunnerRef) -> GithubRunnerConfig {
     }
 }
 
-const DEFAULT_LINUX_RUNNER: &GithubRunnerRef = GithubRunnerRef::from_str("ubuntu-20.04");
+const DEFAULT_LINUX_RUNNER: &GithubRunnerRef = GithubRunnerRef::from_str("ubuntu-24.04");
 
 fn default_global_runner_config() -> GithubRunnerConfig {
     runner_to_config(DEFAULT_LINUX_RUNNER)
@@ -659,7 +659,7 @@ fn github_runner_for_target(
     // where random system dependencies can creep in and be very
     // recent. This helps with portability!
     let result = Some(match target_triple.operating_system {
-        OperatingSystem::Linux => runner_to_config(GithubRunnerRef::from_str("ubuntu-20.04")),
+        OperatingSystem::Linux => runner_to_config(GithubRunnerRef::from_str("ubuntu-24.04")),
         OperatingSystem::Darwin => runner_to_config(GithubRunnerRef::from_str("macos-13")),
         OperatingSystem::Windows => {
             // Default to cargo-xwin for Windows cross-compiles
@@ -677,7 +677,7 @@ fn github_runner_for_target(
 
 fn cargo_xwin() -> GithubRunnerConfig {
     GithubRunnerConfig {
-        runner: GithubRunnerRef::from_str("ubuntu-20.04").to_owned(),
+        runner: GithubRunnerRef::from_str("ubuntu-24.04").to_owned(),
         host: targets::TARGET_X64_LINUX_GNU.to_owned(),
         container: Some(dist_schema::ContainerConfig {
             image: ContainerImageRef::from_str("messense/cargo-xwin").to_owned(),

cargo-dist/src/config/v1/ci/github.rs

@@ -71,7 +71,7 @@ impl ApplyLayer for GithubCiConfig {
     ) {
         self.common.apply_layer(common);
 
-        let mk_default_github_runner = || GithubRunner::new("ubuntu-20.04".to_owned());
+        let mk_default_github_runner = || GithubRunner::new("ubuntu-24.04".to_owned());
         self.runners.apply_val(runners.map(|runners| {
             runners
                 .into_iter()