Fix tests erroring when zlib extension is missing

Author: thekid

src/test/php/io/unittest/DeflatingOutputStreamTest.class.php

@@ -1,7 +1,9 @@
 <?php namespace io\unittest;
 
 use io\streams\DeflatingOutputStream;
+use test\verify\Runtime;
 
+#[Runtime(extensions: ['zlib'])]
 class DeflatingOutputStreamTest extends AbstractCompressingOutputStreamTest {
 
   /** @return string */

src/test/php/io/unittest/InflatingInputStreamTest.class.php

@@ -1,7 +1,9 @@
 <?php namespace io\unittest;
 
 use io\streams\InflatingInputStream;
+use test\verify\Runtime;
 
+#[Runtime(extensions: ['zlib'])]
 class InflatingInputStreamTest extends AbstractDecompressingInputStreamTest {
 
   /** @return string */