Replace TryGetValue/TryRemove by a single TryRemove call to avoid potential issues with concurrent cache removal/addition

src/OpenIddict.Core/Caches/OpenIddictApplicationCache.cs

@@ -378,11 +378,9 @@ namespace OpenIddict.Core
                 throw new InvalidOperationException("The application identifier cannot be extracted.");
             }
 
-            if (_signals.TryGetValue(identifier, out CancellationTokenSource signal))
+            if (_signals.TryRemove(identifier, out CancellationTokenSource signal))
             {
                 signal.Cancel();
-
-                _signals.TryRemove(identifier, out signal);
             }
         }
 

src/OpenIddict.Core/Caches/OpenIddictAuthorizationCache.cs

@@ -596,11 +596,9 @@ namespace OpenIddict.Core
                 throw new InvalidOperationException("The application identifier cannot be extracted.");
             }
 
-            if (_signals.TryGetValue(identifier, out CancellationTokenSource signal))
+            if (_signals.TryRemove(identifier, out CancellationTokenSource signal))
             {
                 signal.Cancel();
-
-                _signals.TryRemove(identifier, out signal);
             }
         }
 

src/OpenIddict.Core/Caches/OpenIddictScopeCache.cs

@@ -349,11 +349,9 @@ namespace OpenIddict.Core
                 throw new InvalidOperationException("The application identifier cannot be extracted.");
             }
 
-            if (_signals.TryGetValue(identifier, out CancellationTokenSource signal))
+            if (_signals.TryRemove(identifier, out CancellationTokenSource signal))
             {
                 signal.Cancel();
-
-                _signals.TryRemove(identifier, out signal);
             }
         }
 

src/OpenIddict.Core/Caches/OpenIddictTokenCache.cs

@@ -679,11 +679,9 @@ namespace OpenIddict.Core
                 throw new InvalidOperationException("The application identifier cannot be extracted.");
             }
 
-            if (_signals.TryGetValue(identifier, out CancellationTokenSource signal))
+            if (_signals.TryRemove(identifier, out CancellationTokenSource signal))
             {
                 signal.Cancel();
-
-                _signals.TryRemove(identifier, out signal);
             }
         }