modules: nanopb: Move pip dependencies to optional module

The west packages extension can be used to install module dependencies.

Upstream nanopb has added the pip package dependencies to the
zephyr/module.yml file. Remove in-tree pip package dependencies.

Signed-off-by: Pieter De Gendt <pieter.degendt@basalte.be>

doc/services/serialization/nanopb.rst

@@ -45,6 +45,7 @@ Additionally, Nanopb is an optional module and needs to be added explicitly to t
 
    west config manifest.project-filter -- +nanopb
    west update
+   west packages pip --install
 
 Configuration
 *************

scripts/requirements-extras.txt

@@ -21,10 +21,6 @@ Pillow>=10.0
 # can be used to sign a Zephyr application binary for consumption by a bootloader
 imgtool>=2.1.0
 
-# used by nanopb module to generate sources from .proto files
-grpcio-tools>=1.47.0
-protobuf>=3.20.3
-
 # used by scripts/release/bug_bash.py for generating top ten bug squashers
 PyGithub
 

submanifests/optional.yaml

@@ -23,7 +23,7 @@ manifest:
       groups:
         - optional
     - name: nanopb
-      revision: 98bf4db69897b53434f3d0ba72e0a3ab1a902824
+      revision: 7307ce399b81ddcb3c3a5dc862c52d4754328d38
       path: modules/lib/nanopb
       remote: upstream
       groups: