icu4c: Update version from 53.1 to 63.1

mozjs 52.2.1 requires at least version 58.1, so upgrade to the latest one.

    checking for icu-i18n >= 58.1... Requested 'icu-i18n >= 58.1' but version of icu-i18n is 53.1
    configure: error: Library requirements (icu-i18n >= 58.1) not met; consider adjusting the PKG_CONFIG_PATH environment variable if your libraries are in a nonstandard prefix so pkg-config can find them.

icu4c.be0

@@ -1,10 +1,10 @@
 #!/bin/env beesh
 
-# BEE_VERSION icu4c-53.1-1
+# BEE_VERSION icu4c-63.1-0
 
 #neu gebaut wegen neuen gcc und firefox
 #SRCURL[0]="http://download.icu-project.org/files/icu4c/4.2.1/icu4c-4_2_1-src.tgz"
-SRCURL[0]="http://download.icu-project.org/files/icu4c/53.1/icu4c-53_1-src.tgz"
+SRCURL[0]="http://download.icu-project.org/files/icu4c/63.1/icu4c-63_1-src.tgz"
 
 build_in_sourcedir