fix(lambda): @deprecated tag to deprecated runtimes (#29081)

### Issue # (if applicable)

Closes #<issue number here>.

### Reason for this change


Updated according to [this document](https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html#runtime-support-policy).

### Description of changes



### Description of how you validated changes



### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/aws-cdk-lib/aws-lambda/lib/runtime.ts

@@ -135,6 +135,7 @@ export class Runtime {
 
   /**
    * The Python 3.7 runtime (python3.7)
+   * @deprecated Legacy runtime no longer supported by AWS Lambda. Migrate to the latest Python runtime.
    */
   public static readonly PYTHON_3_7 = new Runtime('python3.7', RuntimeFamily.PYTHON, {
     supportsInlineCode: true,
@@ -183,6 +184,7 @@ export class Runtime {
 
   /**
    * The Java 8 runtime (java8)
+   * @deprecated Legacy runtime no longer supported by AWS Lambda. Migrate to the latest Java runtime.
    */
   public static readonly JAVA_8 = new Runtime('java8', RuntimeFamily.JAVA, {
     supportsCodeGuruProfiling: true,
@@ -262,6 +264,7 @@ export class Runtime {
 
   /**
    * The Ruby 2.7 runtime (ruby2.7)
+   * @deprecated Legacy runtime no longer supported by AWS Lambda. Migrate to the latest Ruby runtime.
    */
   public static readonly RUBY_2_7 = new Runtime('ruby2.7', RuntimeFamily.RUBY);