grep: Update version from 3.4 to 3.7

Fixes a performance regression introduced in 3.4 [1][2].

[1]: https://www.phoronix.com/scan.php?page=news_item&px=GNU-Grep-3.7
[2]: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=44754
     "Extreme performance degradation in GNU grep 3.4 / 3.6"

grep.be0

@@ -1,12 +1,12 @@
 #!/usr/bin/env beesh
 
-# BEE_VERSION grep-3.4-0
+# BEE_VERSION grep-3.7-0
 # old bee grep-2.18-0
 
 # more info: https://foo.bar.com
 
 #SRCURL[0]="https://ftp.gnu.org/gnu/grep/grep-${PKGVERSION}.tar.xz"
-SRCURL[0]="https://beehive.molgen.mpg.de/111b117d22d6a7d049d6ae7505e9c4d2/grep-3.4.tar.xz"
+SRCURL[0]="https://beehive.molgen.mpg.de/7c9cca97fa18670a21e72638c3e1dabf/grep-3.7.tar.xz"
 
 # PATCHURL+=()