chore: address PR comments - upgrade actions, vitest v4, log errors, remove npx

Co-Authored-By: Niels Swimberghe <3382717+Swimburger@users.noreply.github.com>

Author: devin-ai-integration[bot]

.github/workflows/ci.yml

@@ -10,11 +10,11 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
-          node-version: '18'
+          node-version: '20'
           cache: 'npm'
 
       - name: Install dependencies

dist/index.js

@@ -39400,7 +39400,8 @@ async function updateTargetSpec(token, branch, autoMerge) {
         try {
             fileMapping = JSON.parse(fileMappingInput);
         }
-        catch (_jsonError) {
+        catch (jsonError) {
+            core.debug(`JSON parse also failed: ${jsonError instanceof Error ? jsonError.message : String(jsonError)}`);
             throw new Error(`Failed to parse 'sources' input as either YAML or JSON. Please check the format. Error: ${yamlError.message}`);
         }
     }
@@ -39429,7 +39430,8 @@ async function runFernApiUpdate() {
             await exec.exec("fern", ["--version"], { silent: true });
             core.info("Fern CLI is already installed");
         }
-        catch (_error) {
+        catch (error) {
+            core.debug(`Fern CLI check failed: ${error instanceof Error ? error.message : String(error)}`);
             core.info("Fern CLI not found. Installing Fern CLI...");
             await exec.exec("npm", ["install", "-g", "fern-api"]);
         }
@@ -39468,7 +39470,8 @@ async function cloneRepository(options) {
     try {
         await exec.exec("git", ["clone", repoUrl, repoDir]);
     }
-    catch (_error) {
+    catch (error) {
+        core.debug(`Clone error: ${error instanceof Error ? error.message : String(error)}`);
         throw new Error(`Failed to clone repository. Please ensure your token has 'repo' scope and you have write access to ${options.repository}.`);
     }
     process.chdir(repoDir);