[Security] Stop using a shared changelog for our security packages

src/Symfony/Component/Security/CHANGELOG.md

@@ -1,6 +1,8 @@
 CHANGELOG
 =========
 
+The CHANGELOG for version 5.4 and newer can be found in the security sub-packages (e.g. `Http/`).
+
 5.3
 ---
 

src/Symfony/Component/Security/Core/CHANGELOG.md

@@ -0,0 +1,7 @@
+CHANGELOG
+=========
+
+5.3
+---
+
+The CHANGELOG for version 5.3 and earlier can be found at https://github.com/symfony/symfony/blob/5.3/src/Symfony/Component/Security/CHANGELOG.md

src/Symfony/Component/Security/Csrf/CHANGELOG.md

@@ -0,0 +1,7 @@
+CHANGELOG
+=========
+
+5.3
+---
+
+The CHANGELOG for version 5.3 and earlier can be found at https://github.com/symfony/symfony/blob/5.3/src/Symfony/Component/Security/CHANGELOG.md

src/Symfony/Component/Security/Guard/CHANGELOG.md

@@ -0,0 +1,7 @@
+CHANGELOG
+=========
+
+5.3
+---
+
+The CHANGELOG for version 5.3 and earlier can be found at https://github.com/symfony/symfony/blob/5.3/src/Symfony/Component/Security/CHANGELOG.md

src/Symfony/Component/Security/Http/CHANGELOG.md

@@ -0,0 +1,7 @@
+CHANGELOG
+=========
+
+5.3
+---
+
+The CHANGELOG for version 5.3 and earlier can be found at https://github.com/symfony/symfony/blob/5.3/src/Symfony/Component/Security/CHANGELOG.md