net-firewall/conntrack-tools: remove obsolete 1.4.5

This change removes an outdated conntrack-tools ebuild - version 1.4.5 -
from maintenance branch flatcar-4054. The branch uses 1.4.6-rc1 anyways
so the legacy ebuild can safely be deleted.

This ebuild uses EAPI 6 and will cause a transient error message during
build. It imports the linux-info eclass which was recently updated to
only support EAPI 7 and higher. This will cause emerge to print an
error message when considering the 1.4.5 ebuild. While that error
message has no impact on the build because 1.4.6-rc1 is more recent and
will hence be used, it can be misleading when investigating unrelated
issues (which it did to me, hence this patch).

Signed-off-by: Thilo Fromm <thilofromm@microsoft.com>

sdk_container/src/third_party/portage-stable/net-firewall/conntrack-tools/Manifest

@@ -1,2 +1 @@
-DIST conntrack-tools-1.4.5.tar.bz2 479562 BLAKE2B 229531d1c6c237e539df5b83525dca5ce0b009a76a2a5f873282eabc73cc00095c15c686bc68f9364e81efc846bfa8eac8b08f7fd476199d10d0c25190ca2456 SHA512 480fe2cc4420bc8477a2ba67b3d052bcb39c6b3ec000cff27fc12db70b42ec94fa3b5fe12ee35d439e88d9a631a33cd12ae470b69dde6d371d4e53af62a2eed1
 DIST conntrack-tools-1.4.6.tar.bz2 499806 BLAKE2B 7c1ee1c5fc2b6f9d33c6cf850eca80978b8763317b1a76892cefb776130564f15fbd4e4554fdb08dbba93d9f16b7e4624a1b4dd5a631f747f5fcc0a5b01b8d5e SHA512 a48260308a12b11b584fcf4658ec2c4c1adb2801c9cf9a73fc259e5c30d2fbe401aca21e931972413f03e415f98fbf9bd678d2126faa6c6d5748e8a652e58f1a