Use base32 encoded cache keys to avoid names starting with a hyphen (triton-lang#5088)

Modify the _base64 function used for filename generation to ensure
filenames do not start with a hyphen (`-`).

This change prevents issues on Unix-like systems where filenames
beginning with a hyphen can be misinterpreted as command-line options.

in this way we adhere to to the [The Linux Information Project's File
Naming Conventions](https://www.linfo.org/file_name.html):
> "File names should never begin with a hyphen"

Author: fulvius31

python/triton/runtime/cache.py

@@ -256,9 +256,9 @@ def put_group(self, filename: str, group: Dict[str, str]):
 __cache_cls_nme = "DEFAULT"
 
 
-def _base64(key):
+def _base32(key):
     # Assume key is a hex string.
-    return base64.urlsafe_b64encode(bytes.fromhex(key)).decode("utf-8").rstrip("=")
+    return base64.b32encode(bytes.fromhex(key)).decode("utf-8").rstrip("=")
 
 
 def get_cache_manager(key) -> CacheManager:
@@ -274,15 +274,15 @@ def get_cache_manager(key) -> CacheManager:
         __cache_cls = getattr(module, clz_nme)
         __cache_cls_nme = user_cache_manager
 
-    return __cache_cls(_base64(key))
+    return __cache_cls(_base32(key))
 
 
 def get_override_manager(key) -> CacheManager:
-    return __cache_cls(_base64(key), override=True)
+    return __cache_cls(_base32(key), override=True)
 
 
 def get_dump_manager(key) -> CacheManager:
-    return __cache_cls(_base64(key), dump=True)
+    return __cache_cls(_base32(key), dump=True)
 
 
 def make_so_cache_key(version_hash, signature, constants, ids, **kwargs):
@@ -292,4 +292,4 @@ def make_so_cache_key(version_hash, signature, constants, ids, **kwargs):
     for kw in kwargs:
         key = f"{key}-{kwargs.get(kw)}"
     key = hashlib.sha256(key.encode("utf-8")).hexdigest()
-    return _base64(key)
+    return _base32(key)