ISSUE_TEMPLATE: remove alert blocks that don't render

Markdown alert blocks are not rendered inside dropdown description.

.github/ISSUE_TEMPLATE/01_bug_report.yml

@@ -30,8 +30,7 @@ body:
       description: |
         What version of Nixpkgs are you using?
 
-        > [!IMPORTANT]
-        > If you are using an older version, please update to the latest stable version and check if the issue persists before continuing this bug report.
+        If you are using an older version, please update to the latest stable version and check if the issue persists before continuing this bug report.
       options:
         - "Please select a version."
         - "- Unstable (25.11)"

.github/ISSUE_TEMPLATE/02_bug_report_darwin.yml

@@ -30,8 +30,7 @@ body:
       description: |
         What version of Nixpkgs are you using?
 
-        > [!IMPORTANT]
-        > If you are using an older version, please update to the latest stable version and check if the issue persists before continuing this bug report.
+        If you are using an older version, please update to the latest stable version and check if the issue persists before continuing this bug report.
       options:
         - "Please select a version."
         - "- Unstable (25.11)"

.github/ISSUE_TEMPLATE/03_bug_report_nixos.yml

@@ -30,8 +30,7 @@ body:
       description: |
         What version of Nixpkgs are you using?
 
-        > [!IMPORTANT]
-        > If you are using an older version, please [update to the latest stable version](https://nixos.org/download) and check if the issue persists before continuing this bug report.
+        If you are using an older version, please update to the latest stable version and check if the issue persists before continuing this bug report.
       options:
         - "Please select a version."
         - "- Unstable (25.11)"

.github/ISSUE_TEMPLATE/04_build_failure.yml

@@ -30,9 +30,9 @@ body:
       description: |
         In what version of Nixpkgs did the build failure occur?
 
-        > [!IMPORTANT]
-        > If you are using an older version, please update to the latest stable version and check if the build failure persists before continuing this report.
-        > If you are purposefully trying to build an ancient version of a package in an older Nixpkgs, please coordinate with the [NixOS Archivists](https://matrix.to/#/#archivists:nixos.org).
+        If you are using an older version, please update to the latest stable version and check if the build failure persists before continuing this report.
+
+        If you are purposefully trying to build an ancient version of a package in an older Nixpkgs, please coordinate with the [NixOS Archivists](https://matrix.to/#/#archivists:nixos.org).
       options:
         - "Please select a version."
         - "- Unstable (25.11)"

.github/ISSUE_TEMPLATE/05_update_request.yml

@@ -30,9 +30,9 @@ body:
       description: |
         What version of Nixpkgs are you using?
 
-        > [!IMPORTANT]
-        > If you are using an older or stable version, please update to the latest **unstable** version and check if the package is still out of date.
-        > If the package has been updated in unstable, but you believe the update should be backported to the stable release of Nixpkgs, please file the '**Request: backport to stable**' form instead.
+        If you are using an older or stable version, please update to the latest **unstable** version and check if the package is still out of date.
+
+        If the package has been updated in unstable, but you believe the update should be backported to the stable release of Nixpkgs, please file the '**Request: backport to stable**' form instead.
       options:
         - "Please select a version."
         - "- Unstable (25.11)"

.github/ISSUE_TEMPLATE/06_module_request.yml

@@ -30,8 +30,7 @@ body:
       description: |
         What version of Nixpkgs are you using?
 
-        > [!IMPORTANT]
-        > If you are using an older or stable version, please update to the latest **unstable** version and check if the module still does not exist before continuing this request.
+        If you are using an older or stable version, please update to the latest **unstable** version and check if the module still does not exist before continuing this request.
       options:
         - "Please select a version."
         - "- Unstable (25.11)"