fix(bump): suppress template warning when --bumped-version is used

[orhun]

Description

There is no need to warn about template when --bumped-version argument is being used.

Motivation and Context

see #846

How Has This Been Tested?

Locally.

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 formatted the code with rustfmt.
• I checked the lints with clippy.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 39.94%. Comparing base (fe37d14) to head (6724383).

Files with missing lines	Patch %	Lines
git-cliff/src/lib.rs	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #855   +/-   ##
=======================================
  Coverage   39.94%   39.94%           
=======================================
  Files          20       20           
  Lines        1660     1660           
=======================================
  Hits          663      663           
  Misses        997      997           

Flag	Coverage Δ
unit-tests	39.94% <0.00%> (ø)

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