Description: Add explicit cast to fix ambiguos method call error

Taken from upstream to match expected method call 
https://github.com/biojava/biojava/blob/master/biojava-structure/src/main/java/org/biojava/nbio/structure/chem/ZipChemCompProvider.java

---

Origin: upstream
Forwarded: not-needed
Last-Update: 2022-12-11

--- biojava4-live-4.2.12+dfsg.orig/biojava-structure/src/main/java/org/biojava/nbio/structure/io/mmcif/ZipChemCompProvider.java
+++ biojava4-live-4.2.12+dfsg/biojava-structure/src/main/java/org/biojava/nbio/structure/io/mmcif/ZipChemCompProvider.java
@@ -236,7 +236,7 @@ public class ZipChemCompProvider impleme
 		final String filename = "chemcomp/" + recordName+".cif.gz";
 
 		// try with resources block to read from the filesystem.
-		try (FileSystem fs = FileSystems.newFileSystem(m_zipFile, null)) {
+		try (FileSystem fs = FileSystems.newFileSystem(m_zipFile, (ClassLoader)null)) {
 			Path cif = fs.getPath(filename);
 
 			if (Files.exists(cif)) {
@@ -293,7 +293,7 @@ public class ZipChemCompProvider impleme
 		*/
 
 		// Copy in each file.
-		try (FileSystem zipfs = FileSystems.newFileSystem(zipFile, null)) {
+		try (FileSystem zipfs = FileSystems.newFileSystem(zipFile, (ClassLoader)null)) {
 			Files.createDirectories(pathWithinArchive);
 			for (File f : files) {
 				if (!f.isDirectory() && f.exists()) {