ruby: Update from 2.6.3 to 2.6.4

packages/ruby/build.sh

@@ -2,9 +2,8 @@ TERMUX_PKG_HOMEPAGE=https://www.ruby-lang.org/
 TERMUX_PKG_DESCRIPTION="Dynamic programming language with a focus on simplicity and productivity"
 TERMUX_PKG_LICENSE="BSD 2-Clause"
 _MAJOR_VERSION=2.6
-TERMUX_PKG_VERSION=${_MAJOR_VERSION}.3
-TERMUX_PKG_REVISION=5
-TERMUX_PKG_SHA256=11a83f85c03d3f0fc9b8a9b6cad1b2674f26c5aaa43ba858d4b0fcc2b54171e1
+TERMUX_PKG_VERSION=${_MAJOR_VERSION}.4
+TERMUX_PKG_SHA256=df593cd4c017de19adf5d0154b8391bb057cef1b72ecdd4a8ee30d3235c65f09
 TERMUX_PKG_SRCURL=https://cache.ruby-lang.org/pub/ruby/${_MAJOR_VERSION}/ruby-${TERMUX_PKG_VERSION}.tar.xz
 # libbffi is used by the fiddle extension module:
 TERMUX_PKG_DEPENDS="libandroid-support, libffi, libgmp, readline, openssl, libutil, libyaml, zlib"