revert use toml to fetch opensearch core version

Signed-off-by: xil <fridalu66@gmail.com>

Author: lucy66hw

.github/workflows/convert-proto.yml

@@ -64,8 +64,6 @@ jobs:
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |
-            const toml = require('toml');
-
             // Check if version was provided as input
             const inputVersion = "${{ inputs.opensearch_version }}";
             if (inputVersion && inputVersion.trim() !== "") {
@@ -74,27 +72,28 @@ jobs:
               return;
             }
 
-            // Otherwise fetch version from gradle/libs.versions.toml on main branch
+            // Otherwise fetch version from buildSrc/version.properties on main branch
             try {
               const response = await github.request(
                 'GET /repos/{owner}/{repo}/contents/{path}',
                 {
                   owner: 'opensearch-project',
                   repo: 'OpenSearch',
-                  path: 'gradle/libs.versions.toml',
+                  path: 'buildSrc/version.properties',
                   ref: 'main'
                 }
               );
 
+              // Decode the file content
               const content = Buffer.from(response.data.content, 'base64').toString('utf-8');
 
-              // Parse TOML and extract opensearch version
-              const parsed = toml.parse(content);
-              const version = parsed.versions.opensearch;
+              // Extract opensearch version (e.g., "opensearch = 3.4.0")
+              const match = content.match(/opensearch\s*=\s*([^\s]+)/);
 
-              if (version) {
+              if (match && match[1]) {
+                const version = match[1].trim();
                 core.setOutput("version", version);
-                console.log("Fetched OpenSearch version from gradle/libs.versions.toml: " + version);
+                console.log("Fetched OpenSearch version from source: " + version);
               } else {
                 core.setFailed("Could not find opensearch version in gradle/libs.versions.toml");
               }