Make footer copyright message include current year

[NedReid]

AC1 WHEN: I scroll down to the website footer THEN: I should see © Josephine Butler JCR, 2024

The copyright message on the website footer is still 2023. Fix it!

Tech elaboration:

• This could just be a 1-character fix, making it a great first issue.
• I don't see any reason why we can't just always just set it to new Date().getFullYear(). Maybe do a brief bit of research about whether this is good practice or not, and do this if so.
• The footer is located in frontend/components/global/Footer.jsx

[NedReid]

This is a really simple issue and great for a first issue!