[Internal] Update github cache action version from v2 to v4 (#415)

## What changes are proposed in this pull request?
V2 for actions/cache is deprecated and leading to all PR test failures
([example](2247616)),
upgrading to use v4

## How is this tested?
Existing test passes

Author: tanmay-db

.github/workflows/push.yml

@@ -19,7 +19,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Cache Maven packages
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/.m2
           key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}
@@ -47,7 +47,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Cache Maven packages
-        uses: actions/cache@v2
+        uses: actions/cache@v4
         with:
           path: ~/.m2
           key: ${{ runner.os }}-m2-${{ hashFiles('**/pom.xml') }}

NEXT_CHANGELOG.md

@@ -14,5 +14,6 @@
 * Introduce automated tagging ([#409](https://github.com/databricks/databricks-sdk-java/pull/409)).
 * Update Jobs GetJob API to support paginated responses  ([#403](https://github.com/databricks/databricks-sdk-java/pull/403)).
 * Update Jobs GetRun API to support paginated responses  ([#402](https://github.com/databricks/databricks-sdk-java/pull/402)).
+* Update github cache action version from v2 to v4 ([#415](Update github cache action version from v2 to v4))
 
 ### API Changes