Remove outdated Python package pins

- The setuptools pin was enforcing a version newer than a version from
2016, which seems unnecessary since we are only supporting Python 3.7
and up.
- The coveralls pin was enforcing that we not install a particular
version from 2020.  This again seems unnecessary as we are only
supporting Python 3.7 and up.

setup.py

@@ -97,7 +97,7 @@ def get_version(version_file):
         "ec2-metadata == 2.13.0",
         "psycopg == 3.1.19",
         "schema == 0.7.7",
-        "setuptools >= 24.2.0",
+        "setuptools",
     ],
     extras_require={
         # IMPORTANT: Keep type hinting-related dependencies of the dev section
@@ -113,13 +113,7 @@ def get_version(version_file):
         ],
         "test": [
             "coverage",
-            # coveralls 1.11.0 added a service number for calls from
-            # GitHub Actions. This caused a regression which resulted in a 422
-            # response from the coveralls API with the message:
-            # Unprocessable Entity for url: https://coveralls.io/api/v1/jobs
-            # 1.11.1 fixed this issue, but to ensure expected behavior we'll pin
-            # to never grab the regression version.
-            "coveralls != 1.11.0",
+            "coveralls",
             # We are using the moto syntax that debuted in version
             # 5.0.0.
             "moto[ec2] >= 5.0.0",