Fix vulnerability severity snapshot

ee/spec/frontend/security_dashboard/components/__snapshots__/vulnerability_severity_spec.js.snap

@@ -40,7 +40,7 @@ exports[`Vulnerability Severity component when the data has loaded matches snaps
         >
           <button
             aria-controls="gl-accordion-item-content-container-26"
-            class="btn-transparent border-0 rounded-0 w-100 p-0 text-left cursor-default"
+            class="gl-bg-transparent border-0 rounded-0 w-100 p-0 text-left cursor-default"
             disabled="disabled"
             id="gl-accordion-item-trigger-25"
             type="button"
@@ -117,7 +117,7 @@ exports[`Vulnerability Severity component when the data has loaded matches snaps
         >
           <button
             aria-controls="gl-accordion-item-content-container-28"
-            class="btn-transparent border-0 rounded-0 w-100 p-0 text-left cursor-default"
+            class="gl-bg-transparent border-0 rounded-0 w-100 p-0 text-left cursor-default"
             disabled="disabled"
             id="gl-accordion-item-trigger-27"
             type="button"
@@ -194,7 +194,7 @@ exports[`Vulnerability Severity component when the data has loaded matches snaps
         >
           <button
             aria-controls="gl-accordion-item-content-container-30"
-            class="btn-transparent border-0 rounded-0 w-100 p-0 text-left cursor-default"
+            class="gl-bg-transparent border-0 rounded-0 w-100 p-0 text-left cursor-default"
             disabled="disabled"
             id="gl-accordion-item-trigger-29"
             type="button"
@@ -271,7 +271,7 @@ exports[`Vulnerability Severity component when the data has loaded matches snaps
         >
           <button
             aria-controls="gl-accordion-item-content-container-32"
-            class="btn-transparent border-0 rounded-0 w-100 p-0 text-left cursor-default"
+            class="gl-bg-transparent border-0 rounded-0 w-100 p-0 text-left cursor-default"
             disabled="disabled"
             id="gl-accordion-item-trigger-31"
             type="button"
@@ -348,7 +348,7 @@ exports[`Vulnerability Severity component when the data has loaded matches snaps
         >
           <button
             aria-controls="gl-accordion-item-content-container-34"
-            class="btn-transparent border-0 rounded-0 w-100 p-0 text-left cursor-default"
+            class="gl-bg-transparent border-0 rounded-0 w-100 p-0 text-left cursor-default"
             disabled="disabled"
             id="gl-accordion-item-trigger-33"
             type="button"