[FS#512] uhttpd.init generates certificate with sha1 signature

[LEDE Bugs]

The following task has a new comment added:

FS#512 - uhttpd.init generates certificate with sha1 signature
User who did this - alive4ever (alive4ever)

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So, the sha1 signature issue lies within px5g-standalone package, which is the default px5g backend when installing luci-ssl.

px5g-mbedtls uses sha256 by default, but users need to specify px5g-mbedtls explicitly when installing luci-ssl.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=512#comment1857