Update reference tests

Author: czgdp1807

tests/reference/asr-const_01-af8289b.json

@@ -0,0 +1,13 @@
+{
+    "basename": "asr-const_01-af8289b",
+    "cmd": "lpython --show-asr --no-color {infile} -o {outfile}",
+    "infile": "tests/errors/const_01.py",
+    "infile_hash": "99815a83c10b756d0f7afa75aa637ed8e4e969f9382b456bfd08df31",
+    "outfile": null,
+    "outfile_hash": null,
+    "stdout": null,
+    "stdout_hash": null,
+    "stderr": "asr-const_01-af8289b.stderr",
+    "stderr_hash": "f47e74e916315ec82f38680f66c9cf5ef3c958bcdfa87b9efe09b264",
+    "returncode": 2
+}

tests/reference/asr-const_01-af8289b.stderr

@@ -0,0 +1,5 @@
+semantic error: Constant variable x is not initialised at declaration.
+ --> tests/errors/const_01.py:4:5
+  |
+4 |     x: Const[i32]
+  |     ^^^^^^^^^^^^^ 

tests/reference/asr-const_02-fce29b7.json

@@ -0,0 +1,13 @@
+{
+    "basename": "asr-const_02-fce29b7",
+    "cmd": "lpython --show-asr --no-color {infile} -o {outfile}",
+    "infile": "tests/errors/const_02.py",
+    "infile_hash": "488db60d4763af36319eac3275bb6091a3d71f0dccfb5c1e7155c8fa",
+    "outfile": null,
+    "outfile_hash": null,
+    "stdout": null,
+    "stdout_hash": null,
+    "stderr": "asr-const_02-fce29b7.stderr",
+    "stderr_hash": "b8b90da28518edbe487dbe6f52f1f25f004042fe463e8fba7b96d174",
+    "returncode": 2
+}

tests/reference/asr-const_02-fce29b7.stderr

@@ -0,0 +1,5 @@
+semantic error: Targets with Const[i32] type cannot be re-assigned.
+ --> tests/errors/const_02.py:5:5
+  |
+5 |     x = 5
+  |     ^