Correct deployment target for deploy workflow (2 lines) (pyccel#1872)

The deploy job does not checkout the correct branch which means that the
wrong code is pushed to PyPI. This PR corrects the branch that is
checked out.

Author: EmilyBourne

.github/workflows/deploy.yml

@@ -37,6 +37,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           submodules: true
+          ref: main
       - name: Install dependencies
         uses: ./.github/actions/linux_install
       - name: Update build

CHANGELOG.md

@@ -91,7 +91,7 @@ All notable changes to this project will be documented in this file.
 -   \[INTERNALS\] Remove unused/unnecessary functions in `pyccel.parser.utilities` : `read_file`, `header_statement`, `accelerator_statement`, `get_module_name`, `view_tree`.
 -   \[INTERNALS\] Remove unused functions `Errors.unset_target`, and `Errors.reset_target`.
 
-## \[1.12.0\] - 2024-05-08
+## \[1.12.0\] - 2024-05-13
 
 ### Added