Update isDevelopment check on 6.2 (#9117)

- **Explanation**: We missed flipping the `isDevelopment` flag in both
6.2 and 6.2.1 when updating the versions. This would allow development
tool versions to be used in release.
- **Scope**: Package manifest evaluation
- **Issues**: N/A
- **Original PRs**: N/A (this is specifically a release branch change)
- **Risk**: Very low - this is intended to be flipped in each release
- **Reviewers**: @owenv @bkhouri

---------

Co-authored-by: Sam Khouri <[email protected]>

Author: bnbarham

Sources/Basics/SwiftVersion.swift

@@ -59,7 +59,7 @@ extension SwiftVersion {
     /// The current version of the package manager.
     public static let current = SwiftVersion(
         version: (6, 2, 0),
-        isDevelopment: true,
+        isDevelopment: false,
         buildIdentifier: getBuildIdentifier()
     )
 }

Tests/PackageLoadingTests/PDAppleProductLoadingTests.swift

@@ -18,7 +18,7 @@ import PackageLoading
 
 class PackageDescriptionAppleProductLoadingTests: PackageDescriptionLoadingTests {
     override var toolsVersion: ToolsVersion {
-        .vNext
+        .v6_0 // TODO: confirm this value
     }
 
     func testApplicationProducts() throws {

Tests/PackageLoadingTests/PD_Next_LoadingTests.swift

@@ -16,7 +16,7 @@ import PackageModel
 import _InternalTestSupport
 import XCTest
 
-class PackageDescriptionNextLoadingTests: PackageDescriptionLoadingTests {
+final class PackageDescriptionNextLoadingTests: PackageDescriptionLoadingTests {
     override var toolsVersion: ToolsVersion {
         .vNext
     }

Tests/PackageLoadingTests/TraitLoadingTests.swift

@@ -18,7 +18,7 @@ import XCTest
 
 final class TraitLoadingTests: PackageDescriptionLoadingTests {
     override var toolsVersion: ToolsVersion {
-        .vNext
+        .v6_1
     }
 
     func testTraits() async throws {

Tests/WorkspaceTests/WorkspaceTests.swift

@@ -227,8 +227,57 @@ final class WorkspaceTests: XCTestCase {
                     )
                     """
                 )
+                if SwiftVersion.current.isDevelopment {
+                    XCTAssertMatch(try ws.interpreterFlags(for: packageManifest), [.equal("-swift-version"), .equal("6")])
+                } else {
+                    XCTAssertThrowsError(
+                        try ws.interpreterFlags(for: packageManifest)
+                    )
+                }
+            }
+
+            do {
+                let ws = try createWorkspace(
+                """
+                // swift-tools-version:6.0
+                import PackageDescription
+                let package = Package(
+                    name: "foo"
+                )
+                """
+                )
+
+                XCTAssertMatch(try ws.interpreterFlags(for: packageManifest), [.equal("-swift-version"), .equal("6")])
+            }
+
+            do {
+                let ws = try createWorkspace(
+                """
+                // swift-tools-version:6.1
+                import PackageDescription
+                let package = Package(
+                    name: "foo"
+                )
+                """
+                )
+
+                XCTAssertMatch(try ws.interpreterFlags(for: packageManifest), [.equal("-swift-version"), .equal("6")])
+                XCTAssertMatch(try ws.interpreterFlags(for: packageManifest), [.equal("-package-description-version"), .equal("6.1.0")])
+            }
+
+            do {
+                let ws = try createWorkspace(
+                """
+                // swift-tools-version:6.2
+                import PackageDescription
+                let package = Package(
+                    name: "foo"
+                )
+                """
+                )
 
                 XCTAssertMatch(try ws.interpreterFlags(for: packageManifest), [.equal("-swift-version"), .equal("6")])
+                XCTAssertMatch(try ws.interpreterFlags(for: packageManifest), [.equal("-package-description-version"), .equal("6.2.0")])
             }
 
             do {