Use versioned BR on python3-sphinx-latex

According to Python Packaging Guidelines packages must not have
dependencies with the unversioned 'python-' prefix.
https://docs.fedoraproject.org/en-US/packaging-guidelines/Python/#_dependencies

trellis.spec

@@ -10,7 +10,7 @@
 
 Name:          trellis
 Version:       1.2.1
-Release:       1.%{snapdate}git%{shortcommit0}%{?dist}
+Release:       2.%{snapdate}git%{shortcommit0}%{?dist}
 Summary:       Lattice ECP5 FPGA bitstream creation/analysis/programming tools
 License:       ISC
 URL:           https://github.com/YosysHQ/prj%{name}
@@ -23,7 +23,7 @@ BuildRequires: gcc-c++
 BuildRequires: python3-devel
 BuildRequires: boost-python3-devel
 # for building docs:
-BuildRequires: python-sphinx-latex
+BuildRequires: python3-sphinx-latex
 BuildRequires: python3-recommonmark
 BuildRequires: latexmk
 # for building manpages:
@@ -114,6 +114,9 @@ install -Dpm644 -t %{buildroot}%{_mandir}/man1 man1/*
 %{_datadir}/%{name}/database
 
 %changelog
+* Wed Apr 06 2022 Karolina Surma <ksurma@redhat.com> - 1.2.1-2.20220127git3ae21cf
+- Use versioned BR on python3-sphinx-latex
+
 * Mon Feb 21 2022 Gabriel Somlo <gsomlo@gmail.com> - 1.2.1-1.20220222git3ae21cf
 - Switch upstream to YosysHQ
 - Update to version 1.21