gh-38912: Replace deprecated/removed mem_fun_ref

    
Fixes
```
../src/sage/symbolic/ginac/archive.cpp(584): error C2039: 'mem_fun_ref':
is not a member of 'std'
C:\Program Files\Microsoft Visual
Studio\2022\Community\VC\Tools\MSVC\14.41.34120\include\sstream(19):
note: see declaration of 'std'
../src/sage/symbolic/ginac/archive.cpp(584): error C3861: 'mem_fun_ref':
identifier not found
../src/sage/symbolic/ginac/archive.cpp(584): error C2672: 'for_each': no
matching overloaded function found
```
with  C++17.

Extracted from #38872.

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URL: #38912
Reported by: Tobias Diez
Reviewer(s): Travis Scrimshaw

src/sage/symbolic/ginac/archive.cpp

@@ -581,7 +581,7 @@ void archive::clear()
 /** Delete cached unarchived expressions in all archive_nodes (mainly for debugging). */
 void archive::forget()
 {
-	for_each(nodes.begin(), nodes.end(), std::mem_fun_ref(&archive_node::forget));
+	std::for_each(nodes.begin(), nodes.end(), [](archive_node &node) { node.forget(); });
 }
 
 /** Delete cached unarchived expressions from node (for debugging). */