Remove windows-2019, set ubuntu-22.04 as default

The `windows-2019` GH runner will be removed at the end of this month,
remove it as an option and set the default Windows x86_64 runner to
`windows-2022`.

Also move the default Linux runner down to `ubuntu-22.04` to minimize
the churn in bundled dependencies.

Author: wfchandler

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

@@ -659,14 +659,14 @@ 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-24.04")),
+        OperatingSystem::Linux => runner_to_config(GithubRunnerRef::from_str("ubuntu-22.04")),
         OperatingSystem::Darwin => runner_to_config(GithubRunnerRef::from_str("macos-13")),
         OperatingSystem::Windows => {
             // Default to cargo-xwin for Windows cross-compiles
             if target_triple.architecture != Architecture::X86_64 {
                 cargo_xwin()
             } else {
-                runner_to_config(GithubRunnerRef::from_str("windows-2019"))
+                runner_to_config(GithubRunnerRef::from_str("windows-2022"))
             }
         }
         _ => return Ok(None),

cargo-dist/src/platform/github_runners.rs

@@ -13,19 +13,16 @@ lazy_static::lazy_static! {
         // last updated 2024-10-25
 
         //-------- linux
-        m.insert(GithubRunnerRef::from_str("ubuntu-20.04"), t::TARGET_X64_LINUX_GNU);
         m.insert(GithubRunnerRef::from_str("ubuntu-22.04"), t::TARGET_X64_LINUX_GNU);
         m.insert(GithubRunnerRef::from_str("ubuntu-24.04"), t::TARGET_X64_LINUX_GNU);
         m.insert(GithubRunnerRef::from_str("ubuntu-latest"), t::TARGET_X64_LINUX_GNU);
 
         //-------- windows
-        m.insert(GithubRunnerRef::from_str("windows-2019"), t::TARGET_X64_WINDOWS);
         m.insert(GithubRunnerRef::from_str("windows-2022"), t::TARGET_X64_WINDOWS);
+        m.insert(GithubRunnerRef::from_str("windows-2025"), t::TARGET_X64_WINDOWS);
         m.insert(GithubRunnerRef::from_str("windows-latest"), t::TARGET_X64_WINDOWS);
 
         //-------- macos x64
-        m.insert(GithubRunnerRef::from_str("macos-12"), t::TARGET_X64_MAC); // deprecated
-        m.insert(GithubRunnerRef::from_str("macos-12-large"), t::TARGET_X64_MAC);
         m.insert(GithubRunnerRef::from_str("macos-13"), t::TARGET_X64_MAC);
         m.insert(GithubRunnerRef::from_str("macos-13-large"), t::TARGET_X64_MAC);
         m.insert(GithubRunnerRef::from_str("macos-14-large"), t::TARGET_X64_MAC);
@@ -91,7 +88,7 @@ mod tests {
     #[test]
     fn test_target_for_github_runner() {
         assert_eq!(
-            target_for_github_runner(GithubRunnerRef::from_str("ubuntu-20.04")),
+            target_for_github_runner(GithubRunnerRef::from_str("ubuntu-22.04")),
             Some(t::TARGET_X64_LINUX_GNU)
         );
         assert_eq!(