rpm: update python version in requirements

Part of #5562

Author: ligurio

rpm/tarantool.spec

@@ -76,21 +76,10 @@ BuildRequires: libunwind-devel
 %endif
 
 # Set dependences for tests.
-# Do not install unused Python 3 packages which
-# is default since Fedora 31 and CentOS 8.
-%if (0%{?fedora} >= 31 || 0%{?rhel} >= 8)
-BuildRequires: python2 >= 2.7
-BuildRequires: python2-six >= 1.9.0
-BuildRequires: python2-gevent >= 1.0
-BuildRequires: python2-yaml >= 3.0.9
-%else
-%if (0%{?rhel} != 6 || 0%{?sle_version} >= 1500)
-BuildRequires: python >= 2.7
+BuildRequires: python >= 3.7
 BuildRequires: python-six >= 1.9.0
 BuildRequires: python-gevent >= 1.0
 BuildRequires: python-yaml >= 3.0.9
-%endif
-%endif
 
 Name: tarantool
 # ${major}.${major}.${minor}.${patch}, e.g. 1.6.8.175