Bump dependencies + more ext4 writing

[arihant2math]

• rand 0.9 -> 0.10
• intrusive_collections 0.9 -> 0.10
• ext4_view

ext4 writing

• Adds support for extendable files (but not contractable) via extents (no block map support yet).
• File deletion (frees all blocks and inode)
• File creation
• Add/remove items from directories (including hardlinks and subdirectories) (non-htree)
• Symlink support (both for "fast symlinks" and regular symlinks)
• New directory creation (non-htree)
• Some utility methods for the time being (rename_from can be optimized a little)
• and partridge and a pear tree

Currently apk can install libunistring via apk add --repositories-file=repo.list --allow-untrusted --no-network --no-cache libunistring-1.4.1-r0.apk (create a blank repo.list first with touch repo.list)

also I switched to workspace dependencies where possible to minimize random cases of dependency mismatch.

[hexagonal-sun]

Are there issues with these uplifts? Looks like it passes CI.

[arihant2math]

Are there issues with these uplifts? Looks like it passes CI.

Just fixed a couple of panics with hardlink creation/deletion, should be good now.

[hexagonal-sun]

LGTM!