fix: update regex in sourcePathFromSourceCode to match contracts and …

…libraries

Updated the regular expression in the sourcePathFromSourceCode function to account for both `contract` and `library` declarations. This resolves an issue where library definitions were not being matched, causing the function to return `null`. The new RegExp now looks for both `contract` and `library` keywords.

src/artifact/internal/getBuildArtifact.ts

@@ -94,8 +94,10 @@ export function sourcePathFromSourceCode(
     compilerInput.sources
   )) {
     const sourceCode = (sourceCodeEntry as any).content;
-    const contractPattern = new RegExp(`contract\\s+${contractName}\\s+`, "g");
-
+    const contractPattern = new RegExp(
+      `(contract|library)\\s+${contractName}\\s+`,
+      "g"
+    );
     if (contractPattern.test(sourceCode)) {
       return sourceName;
     }