Add SSL to possible spurious errors (#361)

\cc @konstin

crates/puffin-cli/src/requirements.rs

@@ -37,7 +37,7 @@ impl From<PathBuf> for RequirementsSource {
     }
 }
 
-#[derive(Debug, Default)]
+#[derive(Debug, Default, Clone)]
 pub(crate) enum ExtrasSpecification<'a> {
     #[default]
     None,

crates/puffin-git/src/util/retry.rs

@@ -143,6 +143,7 @@ fn maybe_spurious(err: &Error) -> bool {
             git2::ErrorClass::Net
             | git2::ErrorClass::Os
             | git2::ErrorClass::Zlib
+            | git2::ErrorClass::Ssl
             | git2::ErrorClass::Http => return git_err.code() != git2::ErrorCode::Certificate,
             _ => (),
         }