Update nRF docker image to use more recent openthread (#1907)

After #1879 had been merged CHIP would no longer build with
openthread version included in nRF Connect SDK 1.3.0 due
to lack of otJoinerDiscerner() function.
Therefore, update the docker image to use NCS master
branch where recent openthread changes have already been
merged.

integrations/docker/images/chip-build-nrf-platform/Dockerfile

@@ -47,10 +47,10 @@ RUN set -x \
     # Device Tree Compiler 1.4.7
     && curl -o /tmp/dtc.deb http://mirrors.edge.kernel.org/ubuntu/pool/main/d/device-tree-compiler/device-tree-compiler_1.4.7-3ubuntu2_amd64.deb \
     && dpkg -i /tmp/dtc.deb \
-    # nRF Connect SDK 1.3.0 sources & requirements
+    # nRF Connect SDK [master] sources & requirements
     && (mkdir /var/ncs && cd /var/ncs \
     && pip3 install --no-cache-dir setuptools wheel cmake west \
-    && west init -m https://github.com/nrfconnect/sdk-nrf --mr v1.3.0 \
+    && west init -m https://github.com/nrfconnect/sdk-nrf \
     && west update \
     && pip3 install --no-cache-dir -r zephyr/scripts/requirements.txt \
     && pip3 install --no-cache-dir -r nrf/scripts/requirements.txt \

integrations/docker/images/chip-build/version

@@ -1 +1 @@
-0.4.0
+0.4.1