sanity.conf: Update minimum bitbake version to 1.39.1

We need this for the new break_hardlinks helper function.

(From OE-Core rev: d6ccefd347bf31acf8d31996d796717acb4da74f)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/conf/sanity.conf

@@ -3,7 +3,7 @@
 # See sanity.bbclass
 #
 # Expert users can confirm their sanity with "touch conf/sanity.conf"
-BB_MIN_VERSION = "1.35.0"
+BB_MIN_VERSION = "1.39.1"
 
 SANITY_ABIFILE = "${TMPDIR}/abi_version"