RenderTreeGraph(tree).to_picture("test.png") Error: permission denied
Found a problem when trying to use RenderTreeGraph on a tree structure.
```python
>>> anytree.__version__
'2.12.1'
```
```python
from anytree import Node, RenderTree
from anytree.dotexport import RenderTreeGraph
tree = Node("root")
b = Node("Branch1", parent=tree)
c = Node("Branch2", parent=tree)
d = Node("SubBranch1",parent=c)
e = Node("SubBranch2",parent=c)
RenderTreeGraph(tree).to_picture("tree.png")
```
**Error**
```python
Error: dot: can't open C:\Users\<user>\AppData\Local\Temp\tmpzb2ruk5a: Permission denied
Traceback (most recent call last):
File "C:\Users\<user>\Desktop\PythonScripts\anytree_test.py", line 8, in <module>
RenderTreeGraph(tree).to_picture("tree.png")
File "C:\Python39\lib\site-packages\anytree\exporter\dotexporter.py", line 308, in to_picture
check_call(cmd)
File "C:\Python39\lib\subprocess.py", line 373, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['dot', 'C:\\Users\\<user>\\AppData\\Local\\Temp\\tmpzb2ruk5a', '-T', 'png', '-o', 'tree.png']' returned non-zero exit status 2
```
I found the reason for that issue in: https://github.com/c0fec0de/anytree/blob/65a5d09ce0a592a80918f094ec3fa48b7faca250/anytree/exporter/dotexporter.py#L302C1-L308C28
**Current**
```Python
with NamedTemporaryFile("wb", delete=False) as dotfile:
dotfilename = dotfile.name
for line in self:
dotfile.write(("%s\n" % line).encode("utf-8"))
dotfile.flush()
cmd = ["dot", dotfilename, "-T", fileformat, "-o", filename]
check_call(cmd)
```
**Should be**
```Python
with NamedTemporaryFile("wb", delete=False) as dotfile:
dotfilename = dotfile.name
for line in self:
dotfile.write(("%s\n" % line).encode("utf-8"))
dotfile.flush()
cmd = ["dot", dotfilename, "-T", fileformat, "-o", filename]
check_call(cmd)
```
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