fix syntax

Author: vchudnov-g

noxfile.py

@@ -175,7 +175,7 @@ def fragment(session, use_ads_templates=False):
 
     # The specific failure is `Plugin output is unparseable`
     if session.python in ("3.9", "3.10"):
-        session.install("google-api-core=2.11.0")
+        session.install("google-api-core==2.11.0")
 
     frag_files = (
         [Path(f) for f in session.posargs] if session.posargs else FRAGMENT_FILES
@@ -245,7 +245,7 @@ def showcase_library(
     # appear to cause issues when running protoc.
     # The specific failure is `Plugin output is unparseable`
     if session.python in ("3.9", "3.10"):
-        session.install("google-api-core=2.11.0")
+        session.install("google-api-core==2.11.0")
 
     # Install a client library for Showcase.
     with tempfile.TemporaryDirectory() as tmp_dir: