fix typo: "ToolsVersion.currentVersion" → "ToolsVersion.currentToolsV…

…ersion"

Sources/PackageLoading/ToolsVersionLoader.swift

@@ -207,7 +207,7 @@ public class ToolsVersionLoader: ToolsVersionLoaderProtocol {
                         return "the Swift tools version '\(misspeltVersionSpecifier)' is misspelt or otherwise invalid; consider replacing it with '\(ToolsVersion.currentToolsVersion)' to specify the current Swift toolchain version as the lowest Swift version supported by the project"
                     }
                 case .unidentified:
-                    return "the Swift tools version specification has a formatting error, but the package manager is unable to find either the location or cause of it; consider replacing it with '// swift-tools-version:\(ToolsVersion.currentVersion)' to specify the current Swift toolchain version as the lowest Swift version supported by the project; additionally, please consider filing a bug report on https://bugs.swift.org with this file attached"
+                    return "the Swift tools version specification has a formatting error, but the package manager is unable to find either the location or cause of it; consider replacing it with '// swift-tools-version:\(ToolsVersion.currentToolsVersion)' to specify the current Swift toolchain version as the lowest Swift version supported by the project; additionally, please consider filing a bug report on https://bugs.swift.org with this file attached"
                 }
             case let .backwardIncompatiblePre5_3_1(incompatibility, specifiedVersion):
                 switch incompatibility {
@@ -218,7 +218,7 @@ public class ToolsVersionLoader: ToolsVersionLoaderProtocol {
                 case .spacingAfterLabel(let spacing):
                     return "horizontal whitespace sequence \(unicodeCodePointsPrefixedByUPlus(of: spacing)) immediately preceding the version specifier is supported by only Swift > 5.3; consider removing the sequence for Swift \(specifiedVersion)"
                 case .unidentified:
-                    return "the manifest is backward-incompatible with Swift ≤ 5.3, but the package manager is unable to pinpoint the exact incompatibility; consider replacing the current Swift tools version specification with '// swift-tools-version:\(ToolsVersion.currentVersion)' to specify the current Swift toolchain version as the lowest Swift version supported by the project, then move the new specification to the very beginning of this manifest file; additionally, please consider filing a bug report on https://bugs.swift.org with this file attached"
+                    return "the manifest is backward-incompatible with Swift ≤ 5.3, but the package manager is unable to pinpoint the exact incompatibility; consider replacing the current Swift tools version specification with '// swift-tools-version:\(ToolsVersion.currentToolsVersion)' to specify the current Swift toolchain version as the lowest Swift version supported by the project, then move the new specification to the very beginning of this manifest file; additionally, please consider filing a bug report on https://bugs.swift.org with this file attached"
                 }
             }