fix ci: move to stdexec::inline_scheduler

Move from `exec::inline_scheduler` to `stdexec::inline_scheduler`.

Looks like the definition has been deprecated and is pointing to
`stdexec::inline_scheduler` anyways.

the relevant header
```

namespace exec {
  // A simple scheduler that executes its continuation inline, on the
  // thread of the caller of start().
  using inline_scheduler
    [[deprecated("Use stdexec::inline_scheduler instead")]] = stdexec::inline_scheduler;
} // namespace exec
```

Tested: Inspection only.

Fixes: 10d0b4b7d1498cfd5c3d37edea271a54d1984e41
Change-Id: I1d23cb624e8902c541eeb31bd31155a3207a2da9
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/requester/test/handler_test.cpp b/requester/test/handler_test.cpp
index caa4663..a3c06e5 100644
--- a/requester/test/handler_test.cpp
+++ b/requester/test/handler_test.cpp
@@ -197,7 +197,7 @@
 
             EXPECT_EQ(validResponse, true);
         }),
-        exec::default_task_context<void>(exec::inline_scheduler{}));
+        exec::default_task_context<void>(stdexec::inline_scheduler{}));
 
     pldm::Response mockResponse(sizeof(pldm_msg_hdr) + sizeof(uint8_t), 0);
     auto mockResponsePtr =
@@ -231,7 +231,7 @@
 
             EXPECT_TRUE(false); // unreachable
         }) | stdexec::upon_stopped([&] { stopped = true; }),
-        exec::default_task_context<void>(exec::inline_scheduler{}));
+        exec::default_task_context<void>(stdexec::inline_scheduler{}));
 
     scope.request_stop();
 
@@ -285,7 +285,7 @@
 
                     EXPECT_EQ(expectedTid, respTid);
                 }),
-                exec::default_task_context<void>(exec::inline_scheduler{}));
+                exec::default_task_context<void>(stdexec::inline_scheduler{}));
 
     pldm::Response mockResponse(sizeof(pldm_msg_hdr) + PLDM_GET_TID_RESP_BYTES,
                                 0);