fix: Add bp6 as a banned prefix in no-prefix-literal stylelint rule (#7486)

Co-authored-by: svc-changelog <[email protected]>

Author: pgoldberg

packages/stylelint-plugin/changelog/@unreleased/pr-7486.v2.yml

@@ -0,0 +1,5 @@
+type: fix
+fix:
+  description: Add bp6 as a banned prefix in no-prefix-literal stylelint rule
+  links:
+  - https://github.com/palantir/blueprint/pull/7486

packages/stylelint-plugin/src/rules/no-prefix-literal.ts

@@ -35,7 +35,7 @@ const messages = stylelint.utils.ruleMessages(ruleName, {
     expected: (unfixed: any, fixed: any) => `Use the \`${fixed}\` variable instead of the \`${unfixed}\` literal`,
 });
 
-const bannedPrefixes = ["bp3", "bp4", "bp5"];
+const bannedPrefixes = ["bp3", "bp4", "bp5", "bp6"];
 
 interface Options {
     disableFix?: boolean;