sec(codeql): fix potential cross-site scripting vulnerability

[nikoksr]

Description

Escape user input to prevent potential cross-site scripting attack.

Motivation and Context

CodeQL security alerts #1 and #2.

How Has This Been Tested?

Ran tests locally.

Screenshots / Output (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (no code change)
• Refactor (refactoring production code)
• Other

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

Base: 64.34% // Head: 64.34% // No change to project coverage 👍

Coverage data is based on head (e9dd1a8) compared to base (93a1552).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #427   +/-   ##
=======================================
  Coverage   64.34%   64.34%           
=======================================
  Files          32       32           
  Lines        1091     1091           
=======================================
  Hits          702      702           
  Misses        324      324           
  Partials       65       65           

Impacted Files	Coverage Δ
service/wechat/wechat.go	34.56% <0.00%> (ø)

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[nikoksr]

@svaloumas adding you for the required review. Not that it's really necessary 😆