Add --strict-channel-priority to conda create/install commands

Fix galaxyproject#12790 .

This is added only if using conda >=4.7.5 , which includes this bug
fix: conda/conda#8819

lib/galaxy/tools/deps/conda_util.py

@@ -224,15 +224,14 @@ def exec_create(self, args, allow_local=True, stdout_path=None):
         """
         Return the process exit code (i.e. 0 in case of success).
         """
-        create_base_args = [
-            "-y",
-            "--quiet"
-        ]
+        create_args = ["-y", "--quiet"]
+        if self.conda_version >= packaging.version.parse("4.7.5"):
+            create_args.append("--strict-channel-priority")
         if allow_local and self.use_local:
-            create_base_args.extend(["--use-local"])
-        create_base_args.extend(self._override_channels_args)
-        create_base_args.extend(args)
-        return self.exec_command("create", create_base_args, stdout_path=stdout_path)
+            create_args.extend(["--use-local"])
+        create_args.extend(self._override_channels_args)
+        create_args.extend(args)
+        return self.exec_command("create", create_args, stdout_path=stdout_path)
 
     def exec_remove(self, args):
         """
@@ -252,14 +251,14 @@ def exec_install(self, args, allow_local=True, stdout_path=None):
         """
         Return the process exit code (i.e. 0 in case of success).
         """
-        install_base_args = [
-            "-y"
-        ]
+        install_args = ["-y"]
+        if self.conda_version >= packaging.version.parse("4.7.5"):
+            install_args.append("--strict-channel-priority")
         if allow_local and self.use_local:
-            install_base_args.append("--use-local")
-        install_base_args.extend(self._override_channels_args)
-        install_base_args.extend(args)
-        return self.exec_command("install", install_base_args, stdout_path=stdout_path)
+            install_args.append("--use-local")
+        install_args.extend(self._override_channels_args)
+        install_args.extend(args)
+        return self.exec_command("install", install_args, stdout_path=stdout_path)
 
     def exec_clean(self, args=[], quiet=False):
         """