🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

noxfile.py

@@ -19,7 +19,6 @@
 from __future__ import absolute_import
 import os
 import pathlib
-import re
 import shutil
 import warnings
 
@@ -325,67 +324,3 @@ def docfx(session):
         os.path.join("docs", ""),
         os.path.join("docs", "_build", "html", ""),
     )
-
-
-@nox.session(python=SYSTEM_TEST_PYTHON_VERSIONS)
-def prerelease_deps(session):
-    """Run all tests with prerelease versions of dependencies installed."""
-
-    prerel_deps = [
-        "protobuf",
-        "googleapis-common-protos",
-        "google-auth",
-        "grpcio",
-        "grpcio-status",
-        "google-api-core",
-        "proto-plus",
-        # dependencies of google-auth
-        "cryptography",
-        "pyasn1",
-    ]
-
-    for dep in prerel_deps:
-        session.install("--pre", "--no-deps", "--upgrade", dep)
-
-    # Remaining dependencies
-    other_deps = ["requests"]
-    session.install(*other_deps)
-
-    session.install(*UNIT_TEST_STANDARD_DEPENDENCIES)
-    session.install(*SYSTEM_TEST_STANDARD_DEPENDENCIES)
-
-    # Because we test minimum dependency versions on the minimum Python
-    # version, the first version we test with in the unit tests sessions has a
-    # constraints file containing all dependencies and extras.
-    with open(
-        CURRENT_DIRECTORY
-        / "testing"
-        / f"constraints-{UNIT_TEST_PYTHON_VERSIONS[0]}.txt",
-        encoding="utf-8",
-    ) as constraints_file:
-        constraints_text = constraints_file.read()
-
-    # Ignore leading whitespace and comment lines.
-    deps = [
-        match.group(1)
-        for match in re.finditer(
-            r"^\s*(\S+)(?===\S+)", constraints_text, flags=re.MULTILINE
-        )
-    ]
-
-    # Don't overwrite prerelease packages.
-    deps = [dep for dep in deps if dep not in prerel_deps]
-    # We use --no-deps to ensure that pre-release versions aren't overwritten
-    # by the version ranges in setup.py.
-    session.install(*deps)
-    session.install("--no-deps", "-e", ".[all]")
-
-    # Print out prerelease package versions
-    session.run(
-        "python", "-c", "import google.protobuf; print(google.protobuf.__version__)"
-    )
-    session.run("python", "-c", "import grpc; print(grpc.__version__)")
-
-    session.run("py.test", "tests/unit")
-    session.run("py.test", "tests/system")
-    session.run("py.test", "samples/snippets")