fix migrations for upgrade

database/migrations/2014_10_12_000000_create_users_table.php

@@ -17,7 +17,7 @@ public function up(): void
             $table->string('profile_photo_path', 2048)->nullable();
             $table->text('two_factor_secret')->nullable();
             $table->text('two_factor_recovery_codes')->nullable();
-            $table->string('timezone')->default('UTC');
+            $table->string('timezone')->default('UTC')->nullable();
             $table->timestamps();
         });
     }

database/migrations/2021_06_26_211903_create_sites_table.php

@@ -23,7 +23,7 @@ public function up(): void
             $table->string('branch')->nullable();
             $table->integer('port')->nullable();
             $table->string('status')->default('installing');
-            $table->tinyInteger('progress')->default(0);
+            $table->tinyInteger('progress')->default(0)->nullable();
             $table->timestamps();
         });
     }