security/clamav: Update to new bugfix release 0.103.4
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security/clamav: Update to new bugfix release 0.103.4

This is direct commit to 2021Q4 branch. The reason that it is not MFH
is as following.

On September upstream changed their release and support policy as following.
- They release Regular Feature Release (= x.y.0 release) more frequently. And x.y.z releases are supported until 4 months after the release of x.(y+1).0.
- To compensate for the short lifetime of Regular Feature Releases, Long Term Support (LTS) Feature Release is introduced. A new LTS Feature Release will be identified approximately every two years and be supported for at least three years from the initial publication date of that LTS feature version.
Version 0.103.3 was identified as first LTS Feature Release.
After 2021Q4 branch was created, on main brach security/clamav was updated to 0.104.0 and security/clamav-lts was added.
Version 0.104.0 is first Regular Feature Release that new upstream policy is applied. There are large chages between 0.103.3 and 0.104.0 as upstream refactored their code base.
On November 3rd new bugfix releases 0.104.1 and 0.103.4 were released. On main branch I already updated both security/clamav and security/clamav-lts to their latest releases.
As is exlained above lifetime of 0.104.x isn't so long and there is large difference between 0.103.x and 0.104.x. Furthermore there isn't security/clamav-lts in 2021Q4 branch that can be selected as alternative for those who look for longer lifetime.
So merging 0.104.x to 2021Q4 isn't appropriate in this case and I select to update security/clamav to 0.103.3.