default.xml: Bump bitbake revision

Bump bitbake revision to include bb.build.clean_stamps() which is needed
by oe_core staging.bbclass

* 494fcfcb (HEAD -> 2.0, origin/2.0) build: Add clean_stamp API function to allow removal of task stamps - Richard Purdie
* 943701ee data: Do not depend on vardepvalueexclude flag - Tomasz Dziendzielski
* 8ac6e094 fetch2/osc: Small fixes for osc fetcher - Gunjan Gupta

Signed-off-by: Pavel Zhukov <pavel.zhukov@huawei.com>

manifests/default.xml

@@ -23,7 +23,7 @@ SPDX-FileCopyrightText: Huawei Inc.
 	<remote name="openembedded" fetch="git://git.openembedded.org" />
 	<remote name="seco" fetch="https://git.seco.com" />
 
-	<project name="bitbake" remote="openembedded" revision="59c16ae6c55c607c56efd2287537a1b97ba2bf52" path="bitbake" />
+	<project name="bitbake" remote="openembedded" revision="494fcfcb7c4469915c67f544997104d81c417266 " path="bitbake" />
 	<project name="openembedded-core" remote="openembedded" revision="4eb0b7468383a1d0314b3bfd43ea37c95de464d9" path="oe-core" />
 	<project name="meta-openembedded" remote="openembedded" revision="5357c7a40eaf8d1bcf7ff58edbba8e9527e40c7d" path="meta-openembedded" />
 	<project name="aehs29/meta-freertos" remote="github" revision="98a6838261d36b8f79c5fbae1736492169727a1e" path="meta-freertos" />