Bump version to 2.49.0

[gopkarthik]

New ESPv2 release.

[gopkarthik]

/retest

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dchakarwarti, gopkarthik, TAOXUY

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[gopkarthik]

/retest

[gopkarthik]

/retest

[gopkarthik]

@TAOXUY Shall we force merge this change into master? The test failures are not due to this PR

• ESPv2-anthos-cloud-run-e2e-anthos-cloud-run-http-bookstore all test cases pass & it's log export that failed.
• ESPv2-presubmit* tests seem to be failing for a while now (Update envoy to v1.30.1. #904, Default service_control_enable_api_key_uuid_reporting to true #910 ). Logs don't show any failed test case.

[gopkarthik]

/retest

[google-oss-prow]

@gopkarthik: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ESPv2-presubmit-tsan	d1a7057	link	true	/test ESPv2-presubmit-tsan
ESPv2-presubmit-asan	d1a7057	link	true	/test ESPv2-presubmit-asan
ESPv2-anthos-cloud-run-e2e-anthos-cloud-run-http-bookstore	d1a7057	link	true	/test ESPv2-anthos-cloud-run-e2e-anthos-cloud-run-http-bookstore

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