packagedata.py: silence a DeprecationWarning

Use regex strings (r’’) to silence below deprecation warning [1]:
 $ cat tmp/work/intel_x86_64-wrs-linux/linux-yocto/5.10.x+gitAUTOINC+917c420111_373c02c3ca-r0/temp/log.do_deploy
 [snip]
 /build/layers/oe-core/meta/lib/oe/packagedata.py:22: DeprecationWarning: invalid escape sequence \s
 r = re.compile("(^.+?):\s+(.*)")
 [snip]

[1] https://docs.python.org/3/library/re.html

Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/packagedata.py

@@ -19,7 +19,7 @@ def decode(str):
         import re
         with open(fn, 'r') as f:
             lines = f.readlines()
-        r = re.compile("(^.+?):\s+(.*)")
+        r = re.compile(r"(^.+?):\s+(.*)")
         for l in lines:
             m = r.match(l)
             if m: