.github/workflows/build.yml: bump nuttx-ntfc-testing to release-0.0.2

[JianyuWang0623]

Summary

nuttx-ntfc-testing release-0.0.1's ntfc.yaml pins the sim/citest
requirement to CONFIG_INIT_ENTRYPOINT=nsh_main. Any sim/citest
defconfig that switches its init entrypoint (e.g. to nxinit's
init_main, as in apache/nuttx#19984) then fails ntfc with:

OSError: Missing kconfig dependency: ['CONFIG_INIT_ENTRYPOINT', 'nsh_main']

Maintainer raiden00pl cut nuttx-ntfc-testing release-0.0.2, which
drops that CONFIG_INIT_ENTRYPOINT requirement, and asked that both
nuttx and nuttx-apps workflows be bumped to it:
apache/nuttx-ntfc-testing#7 (comment)

This PR only changes the git clone -b release-0.0.1 line in
.github/workflows/build.yml; the unrelated ntfc==0.0.1 PyPI
package version pin is untouched.

Companion PR in nuttx: apache/nuttx#20025

Impact

CI only (.github/workflows/build.yml), no runtime/code impact.

Testing Build Host(s)

N/A - workflow-only change.

Testing

Diff:

-              git clone -b release-0.0.1 https://github.com/apache/nuttx-ntfc-testing && break
+              git clone -b release-0.0.2 https://github.com/apache/nuttx-ntfc-testing && break

Note on CI: GitHub Actions runs pull_request-triggered workflows
using the workflow file from the base branch, so verification that
nuttx-apps CI still passes with release-0.0.2 is only meaningful
after this merges to master.