Add python3 package that is needed for cgroup-limits file.

There are these dependences:

```
dnf install python3 -y
Package                                                                        Arch              Version                                                                        Repository                                        Size
Installing:
 python3                                                                       aarch64           3.13.0~rc1-2.fc41                                                              fedora                                       211.8 KiB
Installing dependencies:
 expat                                                                         aarch64           2.6.2-2.fc41                                                                   fedora                                       536.9 KiB
 libb2                                                                         aarch64           0.98.1-12.fc41                                                                 fedora                                       202.2 KiB
 mpdecimal                                                                     aarch64           2.5.1-16.fc41                                                                  fedora                                       328.9 KiB
 python-pip-wheel                                                              noarch            24.2-1.fc41                                                                    fedora                                         1.2 MiB
 python3-libs                                                                  aarch64           3.13.0~rc1-2.fc41                                                              fedora                                        49.7 MiB
Installing weak dependencies:
 python-unversioned-command                                                    noarch            3.13.0~rc1-2.fc41                                                              fedora                                        23.0   B

```

Signed-off-by: Petr "Stone" Hracek <[email protected]>

core/Dockerfile.f41

@@ -42,6 +42,7 @@
   gettext \
   glibc-langpack-en \
   groff-base \
+  python3 \
   rsync \
   tar \
   unzip" && \