oraclejdk: add explicit version manifests

Add oraclejdk-21.json (LTS) and oraclejdk-26.json to follow bucket pattern.

This gives users explicit version pinning alongside the generic
oraclejdk (latest) and oraclejdk-lts (latest LTS) options.

Relates to #566

Author: B67687

bucket/oraclejdk-21.json

@@ -0,0 +1,33 @@
+{
+    "description": "Oracle Java Platform, Standard Edition Development Kit (JDK) 21 LTS",
+    "homepage": "https://www.oracle.com/java/technologies/downloads/#java21",
+    "version": "21.0.11",
+    "license": "https://www.oracle.com/downloads/licenses/no-fee-license.html",
+    "architecture": {
+        "64bit": {
+            "url": "https://download.oracle.com/java/21/archive/jdk-21.0.11_windows-x64_bin.zip",
+            "hash": "947660f83b33bcda0da3497b2959bce1523fc3a000689147e3671574c8e47eca"
+        }
+    },
+    "extract_dir": "jdk-21.0.11",
+    "env_add_path": "bin",
+    "env_set": {
+        "JAVA_HOME": "$dir"
+    },
+    "checkver": {
+        "url": "https://www.oracle.com/java/technologies/javase/21u-relnotes.html",
+        "useragent": "curl/7",
+        "regex": "<li>JDK ([\\d.]+)"
+    },
+    "autoupdate": {
+        "architecture": {
+            "64bit": {
+                "url": "https://download.oracle.com/java/$majorVersion/archive/jdk-$version_windows-x64_bin.zip"
+            }
+        },
+        "hash": {
+            "url": "$url.sha256"
+        },
+        "extract_dir": "jdk-$version"
+    }
+}

bucket/oraclejdk-26.json

@@ -0,0 +1,33 @@
+{
+    "description": "Oracle Java Platform, Standard Edition Development Kit (JDK) 26",
+    "homepage": "https://www.oracle.com/java/",
+    "version": "26.0.1",
+    "license": "https://www.oracle.com/downloads/licenses/no-fee-license.html",
+    "architecture": {
+        "64bit": {
+            "url": "https://download.oracle.com/java/26/archive/jdk-26.0.1_windows-x64_bin.zip",
+            "hash": "6ce5d87324f2b47ea714a9b394e24e3db8b247c620e1dd47ae140859a90f28c1"
+        }
+    },
+    "extract_dir": "jdk-26.0.1",
+    "env_add_path": "bin",
+    "env_set": {
+        "JAVA_HOME": "$dir"
+    },
+    "checkver": {
+        "url": "https://www.oracle.com/java/technologies/downloads/",
+        "useragent": "curl/7",
+        "regex": "Java SE Development Kit ([\\d.]+) downloads"
+    },
+    "autoupdate": {
+        "architecture": {
+            "64bit": {
+                "url": "https://download.oracle.com/java/$majorVersion/archive/jdk-$version_windows-x64_bin.zip"
+            }
+        },
+        "hash": {
+            "url": "$url.sha256"
+        },
+        "extract_dir": "jdk-$version"
+    }
+}