doc: ci: github: Require hashes during pip install

require hashes in doc ci workflow

Signed-off-by: Benjamin Cabé <[email protected]>

Author: kartben

.github/workflows/doc-build.yml

@@ -109,7 +109,7 @@ jobs:
     - name: install-pip
       working-directory: zephyr
       run: |
-        pip install -r doc/requirements.txt
+        pip install -r doc/requirements.txt --require-hashes
 
     - name: build-docs
       shell: bash
@@ -220,7 +220,7 @@ jobs:
     - name: install-pip-pkgs
       working-directory: zephyr
       run: |
-        pip install -r doc/requirements.txt
+        pip install -r doc/requirements.txt --require-hashes
 
     - name: build-docs
       shell: bash