Omit dynamic versions from the lockfile (#10622)

## Summary

This PR modifies the lockfile to omit versions for source trees that use
`dynamic` versioning, thereby enabling projects to use dynamic
versioning with `uv.lock`.

Prior to this change, dynamic versioning was largely incompatible with
locking, especially for popular tools like `setuptools_scm` -- in that
case, every commit bumps the version, so every commit invalidates the
committed lockfile.

Closes #7533.

crates/uv-distribution-types/src/dependency_metadata.rs

@@ -51,6 +51,7 @@ impl DependencyMetadata {
                 requires_dist: metadata.requires_dist.clone(),
                 requires_python: metadata.requires_python.clone(),
                 provides_extras: metadata.provides_extras.clone(),
+                dynamic: false,
             })
         } else {
             // If no version was requested (i.e., it's a direct URL dependency), allow a single
@@ -70,6 +71,7 @@ impl DependencyMetadata {
                 requires_dist: metadata.requires_dist.clone(),
                 requires_python: metadata.requires_python.clone(),
                 provides_extras: metadata.provides_extras.clone(),
+                dynamic: false,
             })
         }
     }

crates/uv-distribution/src/metadata/mod.rs

@@ -50,6 +50,7 @@ pub struct Metadata {
     pub requires_python: Option<VersionSpecifiers>,
     pub provides_extras: Vec<ExtraName>,
     pub dependency_groups: BTreeMap<GroupName, Vec<uv_pypi_types::Requirement>>,
+    pub dynamic: bool,
 }
 
 impl Metadata {
@@ -67,6 +68,7 @@ impl Metadata {
             requires_python: metadata.requires_python,
             provides_extras: metadata.provides_extras,
             dependency_groups: BTreeMap::default(),
+            dynamic: metadata.dynamic,
         }
     }
 
@@ -109,6 +111,7 @@ impl Metadata {
             requires_python: metadata.requires_python,
             provides_extras,
             dependency_groups,
+            dynamic: metadata.dynamic,
         })
     }
 }