Pull request: all: switch to SOURCE_DATE_EPOCH for source date

Closes #4221.

Squashed commit of the following:

commit c84a5699280cf4c0b1c2ed034a44f05ffc74d30d
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Feb 1 21:13:30 2022 +0300

    all: switch to SOURCE_DATE_EPOCH for source date

scripts/make/version.sh

@@ -86,6 +86,7 @@ in
 	# minor release.  If the current commit is the new minor release,
 	# num_commits_since_minor is zero.
 	num_commits_since_minor="$( git rev-list "${last_minor_zero}..HEAD" | wc -l )"
+
 	# The output of darwin's implementation of wc needs to be trimmed from
 	# redundant spaces.
 	num_commits_since_minor="$( echo "$num_commits_since_minor" | tr -d '[:space:]' )"