Fix copier command in documentation (jupyterlab#14671)

Author: fcollonval

RELEASE.md

@@ -311,7 +311,7 @@ To seed the latest version of the extension template (first commit), you
 can execute (assuming you are editing the first commit):
 
 ```sh
-copier copy https://github.com/jupyterlab/extension-template .
+copier copy --UNSAFE https://github.com/jupyterlab/extension-template .
 # Fix any conflicts
 git commit --amend '-S'
 ```
@@ -330,7 +330,7 @@ updating package versions, then do the next steps instead.
 git checkout --orphan name-of-branch
 git rm -rf .
 git clean -dfx
-copier https://github.com/jupyterlab/extension-template .
+copier copy --UNSAFE https://github.com/jupyterlab/extension-template .
 ```
 
 - Create a new PR in JupyterLab.

docs/source/extension/extension_migration.rst

@@ -23,14 +23,14 @@ First, make sure to update to JupyterLab 4 and install ``copier`` and some depen
 .. code:: bash
 
    pip install -U jupyterlab
-   pip install copier jinja2-time tomli-w
+   pip install "copier~=8.0" jinja2-time tomli-w
 
 
 Or with ``conda``:
 
 .. code:: bash
 
-   conda install -c conda-forge jupyterlab=4 copier jinja2-time tomli-w
+   conda install -c conda-forge jupyterlab=4 "copier=8" jinja2-time tomli-w
 
 
 Then at the root folder of the extension, run:

docs/source/extension/extension_tutorial.rst

@@ -66,7 +66,7 @@ new environment named ``jupyterlab-ext``.
 
 .. code:: bash
 
-    conda create -n jupyterlab-ext --override-channels --strict-channel-priority -c conda-forge -c nodefaults jupyterlab=4 nodejs=18 git copier jinja2-time
+    conda create -n jupyterlab-ext --override-channels --strict-channel-priority -c conda-forge -c nodefaults jupyterlab=4 nodejs=18 git copier=8 jinja2-time
 
 Now activate the new environment so that all further commands you run
 work out of that environment.
@@ -101,7 +101,7 @@ This will create a new folder for your extension in your current directory.
 
     mkdir my_first_extension
     cd my_first_extension
-    copier https://github.com/jupyterlab/extension-template .
+    copier copy --UNSAFE https://github.com/jupyterlab/extension-template .
 
 When prompted, enter values like the following for all of the template
 prompts (``apod`` stands for Astronomy Picture of the Day, the NASA service we

docs/source/extension/notebook.rst

@@ -209,10 +209,10 @@ Start from the extension template.
 
 .. code-block:: shell
 
-    pip install copier jinja2-time
+    pip install "copier~=8.0" jinja2-time
     mkdir myextension
     cd myextension
-    copier https://github.com/jupyterlab/extension-template .
+    copier copy --UNSAFE https://github.com/jupyterlab/extension-template .
 
 Install the dependencies. Note that extensions are built against the
 released npm packages, not the development versions.