test: remove python 3.7 and 3.8 from noxfile unit tests (#355)

* test: remove python 3.7 and 3.8 from noxfile unit tests

* 🦉 Updates from OwlBot post-processor

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

* undo owlbot change

* add owlbot string replacement

* correct regex

* 🦉 Updates from OwlBot post-processor

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

* correct regex

* modify noxfile

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: Linchin

packages/google-cloud-dns/noxfile.py

@@ -72,7 +72,12 @@
 CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
 
 nox.options.sessions = [
-    "unit",
+    "unit-3.9",
+    "unit-3.10",
+    "unit-3.11",
+    "unit-3.12",
+    "unit-3.13",
+    "unit-3.14",
     "system",
     "cover",
     "lint",

packages/google-cloud-dns/owlbot.py

@@ -39,6 +39,21 @@
     'session.python in ("3.11", "3.12", "3.13", "3.14")'
 )
 
+s.replace(
+    "noxfile.py",
+    """nox\.options\.sessions = \[
+    "unit",
+	""",
+    """nox.options.sessions = [
+    "unit-3.9",
+    "unit-3.10",
+    "unit-3.11",
+    "unit-3.12",
+    "unit-3.13",
+    "unit-3.14",
+	""",
+)
+
 s.replace(
     ".kokoro/presubmit/presubmit.cfg",
     """# Format: //devtools/kokoro/config/proto/build.proto""",