Config: fix malformed regex pattern in mlc_config.json

[viktorking7]

Problem: The regex pattern "[]*csl-json"inconfig/mlc_config.jsoncontains an unescaped closing bracket]` within a character class, which can cause incorrect pattern matching behavior.

Solution: Escape the closing bracket to ensure proper regex parsing:

• Before: "[]*csl-json"`
• After: "[]]*csl-json"`

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[eth-bot]

File config/mlc_config.json

Requires 2 more reviewers from @g11tech, @lightclient, @samwilsn, @xinbenlv

[g11tech]

leaving to @SamWilsn for taking call on this PR