fix: don't use multi-line :not()

fixes #21995

Author: KaelWD

packages/vuetify/src/components/VAlert/VAlert.sass

@@ -147,10 +147,7 @@
 
 @media (forced-colors: active)
   .v-alert
-    &:not(
-      &--variant-text,
-      &--variant-plain
-    )
+    &:not(&--variant-text, &--variant-plain)
       border-style: solid
 
     &--variant-outlined,

packages/vuetify/src/components/VBtn/VBtn.sass

@@ -261,10 +261,7 @@
 
 @media (forced-colors: active)
   .v-btn
-    &:not(
-      &--variant-text,
-      &--variant-plain
-    )
+    &:not(&--variant-text, &--variant-plain)
       border: thin solid
 
     &:focus-visible

packages/vuetify/src/components/VCard/VCard.sass

@@ -206,8 +206,5 @@
 
   @media (forced-colors: active)
     .v-card
-      &:not(
-        &--variant-text,
-        &--variant-plain
-      )
+      &:not(&--variant-text, &--variant-plain)
         border: thin solid

packages/vuetify/src/components/VChip/VChip.sass

@@ -89,8 +89,5 @@
 
   @media (forced-colors: active)
     .v-chip
-      &:not(
-        &--variant-text,
-        &--variant-plain
-      )
+      &:not(&--variant-text, &--variant-plain)
         border: thin solid