webkitgtk,wpewebkit: Bump up version to 2.32.4

[psaavedra]

• Do not append .asc extension to downloaded text/plain files.
• Fix several crashes and rendering issues

Security Advisory:

• Several vulnerabilities were discovered in WebKitGTK and WPE WebKit.
• https://webkitgtk.org/security/WSA-2021-0005.html

CVE-2021-30858 Versions affected: WebKitGTK and WPE WebKit before 2.32.4. Credit to an anonymous researcher. Impact: Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited. Description: A use after free issue was addressed with improved memory management.