[Tomcat] Update README.md

[niraj-elastic]

• Deprecation

What does this PR do?.

• Add link of new apache_tomcat package in README.md.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have added an entry to my package's changelog.yml file.

How to test this PR locally

• Clone integrations repo.
• Install elastic-package locally.
• Start elastic stack using elastic-package.
• Move to integrations/packages/tomcat) directory.
• Run the following command to run tests. elastic-package test

Related issues

• Relates [Meta] Create Package for Apache Tomcat Integration #5200

[elasticmachine]

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• Start Time: 2023-05-09T06:57:20.164+0000

• Duration: 17 min 57 sec

Test stats 🧪

Test	Results
Failed	0
Passed	7
Skipped	0
Total	7

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚 3.013
Classes	100.0% (1/1)	💚 3.013
Methods	77.778% (7/9)	👎 -14.008
Lines	82.143% (46/56)	👎 -9.942
Conditionals	100.0% (0/0)	💚

[kush-elastic]

LGTM!

[ishleenk17]

Looks good!

[elasticmachine]

Package tomcat - 1.8.3 containing this change is available at https://epr.elastic.co/search?package=tomcat