chore: fix implicit deprecated warnings (#154)

Author: ChiragAgg5k

src/Storage/Device/Local.php

@@ -62,7 +62,7 @@ public function getRoot(): string
      * @param  string|null  $prefix
      * @return string
      */
-    public function getPath(string $filename, string $prefix = null): string
+    public function getPath(string $filename, ?string $prefix = null): string
     {
         return $this->getAbsolutePath($this->getRoot().DIRECTORY_SEPARATOR.$filename);
     }
@@ -270,7 +270,7 @@ public function abort(string $path, string $extra = ''): bool
      *
      * @throws Exception
      */
-    public function read(string $path, int $offset = 0, int $length = null): string
+    public function read(string $path, int $offset = 0, ?int $length = null): string
     {
         if (! $this->exists($path)) {
             throw new NotFoundException('File not found');

src/Storage/Device/S3.php

@@ -167,7 +167,7 @@ public function getRoot(): string
      * @param  string|null  $prefix
      * @return string
      */
-    public function getPath(string $filename, string $prefix = null): string
+    public function getPath(string $filename, ?string $prefix = null): string
     {
         return $this->getRoot().DIRECTORY_SEPARATOR.$filename;
     }
@@ -410,12 +410,12 @@ public function abort(string $path, string $extra = ''): bool
      *
      * @param  string  $path
      * @param int offset
-     * @param int length
+     * @param int|null length
      * @return string
      *
      * @throws \Exception
      */
-    public function read(string $path, int $offset = 0, int $length = null): string
+    public function read(string $path, int $offset = 0, ?int $length = null): string
     {
         unset($this->amzHeaders['x-amz-acl']);
         unset($this->amzHeaders['x-amz-content-sha256']);

src/Storage/Device/Telemetry.php

@@ -54,7 +54,7 @@ public function getRoot(): string
         return $this->underlying->getRoot();
     }
 
-    public function getPath(string $filename, string $prefix = null): string
+    public function getPath(string $filename, ?string $prefix = null): string
     {
         return $this->measure(__FUNCTION__, $filename, $prefix);
     }
@@ -74,7 +74,7 @@ public function abort(string $path, string $extra = ''): bool
         return $this->measure(__FUNCTION__, $path, $extra);
     }
 
-    public function read(string $path, int $offset = 0, int $length = null): string
+    public function read(string $path, int $offset = 0, ?int $length = null): string
     {
         return $this->measure(__FUNCTION__, $path, $offset, $length);
     }