manifests: Bump oe-core kirkstone revision

The pre-integration oe-core fork has been updated with latest kirkstone
changes, including libusb 1.0.26, fixing a crash in the OpenHarmony hdc
tool. This change updates the default manifest to the corresponding
oe-core revision.

Signed-off-by: Thierry Escande <thierry.escande@huawei.com>

manifests/default.xml

@@ -7,7 +7,7 @@ SPDX-FileCopyrightText: Huawei Inc.
   <include name="manifests/trunk.xml" />
 
   <extend-project name="bitbake" revision="c212b0f3b542efa19f15782421196b7f4b64b0b9" />
-  <extend-project name="openembedded-core" revision="c3cc3fa4042d0871b4bb9a9277acee555ae9e231" />
+  <extend-project name="openembedded-core" revision="50a0c2ab1aebcd62c66755b8eb000d36ece0ae8b" />
   <extend-project name="meta-openembedded" revision="6fbe7f748706229f43a2e06b08b6e1e729942314" />
   <extend-project name="meta-java" revision="1a8059f6b257ebe6fcae6416e499784d976afd24" />
   <extend-project name="meta-riscv" revision="70e099d7ceca52a1dde2c978713012f6b20a9891" />