chore: clean CHANGELOG

I accidently made a release before merging the pyproject.toml version
bump. The CI release completed all its steps, like updating the
CHANGELOG, but then failed at the final step of pushing to PyPI. So then
when I ran the CI release again, there were duplicated entries in
CHANGELOG.

CHANGELOG.md

@@ -17,65 +17,6 @@ More details: https://github.com/openlawlibrary/pygls/releases/tag/v1.2.0
 
 ### Miscellaneous Tasks
 
-- Update CHANGELOG.md
-- Update CONTRIBUTORS.md
-- Update `poetry.lock` after removing typeguard
-- Add example configuration
-- Pin lsprotocol to 2023.0.0
-- Update CHANGELOG.md
-- Update CONTRIBUTORS.md
-- Update CHANGELOG.md
-
-### Refactor
-
-- Move workspace/ into servers/ dir
-
-### Build
-
-- V1.2.0
-
-## [1.2.0] - 2023-11-18
-More details: https://github.com/openlawlibrary/pygls/releases/tag/v1.2.0
-
-### Bug Fixes
-
-- Remove dependency on typeguard
-- Linting and formatting issues
-- Simplify option validation check
-- Index error on empty workspace
-
-### Features
-
-- Allow user to override Python interpreter
-
-### Miscellaneous Tasks
-
-- Update CHANGELOG.md
-- Update CONTRIBUTORS.md
-- Update `poetry.lock` after removing typeguard
-- Add example configuration
-- Pin lsprotocol to 2023.0.0
-
-### Refactor
-
-- Move workspace/ into servers/ dir
-
-## [1.2.0] - 2023-11-18
-More details: https://github.com/openlawlibrary/pygls/releases/tag/v1.2.0
-
-### Bug Fixes
-
-- Remove dependency on typeguard
-- Linting and formatting issues
-- Simplify option validation check
-- Index error on empty workspace
-
-### Features
-
-- Allow user to override Python interpreter
-
-### Miscellaneous Tasks
-
 - Update CHANGELOG.md
 - Update CONTRIBUTORS.md
 - Update `poetry.lock` after removing typeguard