Fix malformed submodule URL in .gitmodules

[Copilot]

The erdos-graph submodule URL contained an extra / after github.com: which prevented submodule initialization and broke the automated update workflow.

Changes

• Corrected SSH URL format in .gitmodules:

  - url = git@github.com:/erdos-network/erdos-graph.git
  + url = git@github.com:erdos-network/erdos-graph.git

Original prompt

Fix Submodule Configuration

The .gitmodules file contains a malformed URL for the erdos-graph submodule that prevents proper initialization.

Changes Required

Fix the submodule URL in .gitmodules:

• Current: url = git@github.com:/erdos-network/erdos-graph.git
• Should be: url = git@github.com:erdos-network/erdos-graph.git

Remove the extra colon after github.com in the URL.

Context

The malformed URL causes submodule operations to fail. This is preventing the automated submodule update workflow from the erdos-graph repository from working correctly.

This pull request was created from Copilot chat.

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