Merge macOS "Python 3.13+" and "Python 3.11-3.12" tabs

[hugovk]

Describe the bug

1. Go to https://devguide.python.org/getting-started/setup-building/#install-dependencies
2. Click the macOS tab (if not already selected)
3. Click the Homebrew tab (if not already selected)
4. Compare the "Python 3.13+" and "Python 3.11-3.12" tabs

After #1598, they have the same content:

GDBM_CFLAGS="-I$(brew --prefix gdbm)/include" \
   GDBM_LIBS="-L$(brew --prefix gdbm)/lib -lgdbm" \
   ./configure --with-pydebug \
               --with-openssl="$(brew --prefix openssl@3)"

Screenshots

No response

Additional context

Let's merge them:

• Remove the "Python 3.11-3.12" tab
• Change the "Python 3.13+" tab to "Python 3.11+"
• Change the "For Python 3.13 and newer:" text to "For Python 3.11 and newer:"