Bump the wheel and sdist cache versions (#7560)

## Summary

Both of these can contain rkyv data in their HTTP cache envelopes. As
such, the entries aren't readable by earlier versions of uv, and `uv
cache prune` can break. I should make `uv cache prune` robust to this,
but this feels safest.

crates/uv-cache/src/lib.rs

@@ -759,15 +759,16 @@ pub enum CacheBucket {
 impl CacheBucket {
     fn to_str(self) -> &'static str {
         match self {
-            // Note, next time we change the version we should change the name of this bucket to `source-dists-v0`
-            Self::SourceDistributions => "built-wheels-v3",
+            Self::SourceDistributions => "sdists-v4",
             Self::FlatIndex => "flat-index-v0",
             Self::Git => "git-v0",
             Self::Interpreter => "interpreter-v2",
             // Note that when bumping this, you'll also need to bump it
             // in crates/uv/tests/cache_clean.rs.
             Self::Simple => "simple-v13",
-            Self::Wheels => "wheels-v1",
+            // Note that when bumping this, you'll also need to bump it
+            // in crates/uv/tests/cache_prune.rs.
+            Self::Wheels => "wheels-v2",
             Self::Archive => "archive-v0",
             Self::Builds => "builds-v0",
             Self::Environments => "environments-v1",

crates/uv/tests/cache_prune.rs

@@ -142,7 +142,7 @@ fn prune_stale_symlink() -> Result<()> {
         .success();
 
     // Remove the wheels directory, causing the symlink to become stale.
-    let wheels = context.cache_dir.child("wheels-v1");
+    let wheels = context.cache_dir.child("wheels-v2");
     fs_err::remove_dir_all(wheels)?;
 
     let filters: Vec<_> = context
@@ -330,7 +330,7 @@ fn prune_stale_revision() -> Result<()> {
     ----- stderr -----
     DEBUG uv [VERSION] ([COMMIT] DATE)
     Pruning cache at: [CACHE_DIR]/
-    DEBUG Removing dangling source revision: [CACHE_DIR]/built-wheels-v3/[ENTRY]
+    DEBUG Removing dangling source revision: [CACHE_DIR]/sdists-v4/[ENTRY]
     DEBUG Removing dangling cache archive: [CACHE_DIR]/archive-v0/[ENTRY]
     Removed 8 files ([SIZE])
     "###);