Update CI workflows to use bun and checkout action v4

Author: EugeneDraitsev

.github/workflows/deploy.yml

@@ -9,8 +9,8 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - run: yarn
-      - run: yarn lint
-      - run: yarn tsc
-      - run: yarn test
+      - uses: actions/checkout@v4
+      - run: bun install
+      - run: bun lint
+      - run: bun tsc
+      - run: bun run test

.github/workflows/pull-request.yml

@@ -9,8 +9,8 @@ jobs:
   checks:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - run: yarn
-      - run: yarn lint
-      - run: yarn tsc
-      - run: yarn test
+      - uses: actions/checkout@v4
+      - run: bun install
+      - run: bun lint
+      - run: bun tsc
+      - run: bun run test