gh-99453 Add ValueError error handling for cookiejar.py

[Mosh333]

Added ValueError error handling for cookiejar.py. Bug ticket raised forced a ValueError by attempting to load an empty MozillaCookieJar object. This caused an error in line 2041, where it attempted to unpack and assign 1 value to 7 values.

• Issue: incorrect "http.cookiejar bug" when catching exception #99453

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[Mosh333]

Sample code output for proposed change:

$ ./python.exe cookiesReproTest.py; echo "Version used: $(./python.exe -V)"
Traceback (most recent call last):
  File "/Users/namehere/Documents/GitHub/cpython_issue99453/cookiesReproTest.py", line 17, in <module>
    jar.load()
  File "/Users/namehere/Documents/GitHub/cpython_issue99453/Lib/http/cookiejar.py", line 1802, in load
    self._really_load(f, filename, ignore_discard, ignore_expires)
  File "/Users/namehere/Documents/GitHub/cpython_issue99453/Lib/http/cookiejar.py", line 2041, in _really_load
    domain, domain_specified, path, secure, expires, name, value = \
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: not enough values to unpack (expected 7, got 1)
Version used: Python 3.12.0a2+

cookiesReproTest.py is the script that was shared in the original bug ticket.