re-add apt install of gettext; required for mpy-cross via build tools

.github/workflows/build.yml

@@ -30,6 +30,7 @@ jobs:
         submodules: true
     - name: Install deps
       run: |
+        sudo apt-get install gettext
         pip install -r requirements.txt
     - name: Library version
       run: git describe --dirty --always --tags

.github/workflows/release.yml

@@ -32,6 +32,7 @@ jobs:
         submodules: true
     - name: Install deps
       run: |
+        sudo apt-get install gettext
         pip install -r requirements.txt
     - name: Build assets
       run: circuitpython-build-bundles --filename_prefix ${{ steps.repo-name.outputs.repo-name }} --library_location libraries --library_depth 2