Bump version to 3.9.0

[rm3l]

What type of PR is this:
Bumps version to 3.9.0

What does this PR do / why we need it:

Which issue(s) this PR fixes:
Related to #6643

PR acceptance criteria:

• Unit test

• Integration test

• Documentation

How to test changes / Special notes to the reviewer:

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[odo-robot]

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[odo-robot]

Windows Tests (OCP) on commit finished with errors.
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[rm3l]

  [FAILED] Expected
      <*url.Error | 0xc0002ac930>: {
          Op: "Post",
          URL: "http://127.0.0.1:64379/api/newuser",
          Err: <*errors.errorString | 0xc00008a130>{s: "EOF"},
      }
  to be nil
  In [It] at: C:/Users/Administrator.ANSIBLE-TEST-VS/3620/tests/e2escenarios/e2e_test.go:306 @ 04/05/23 03:05:44.82

  There were additional failures detected.  To view them in detail run ginkgo -vv
------------------------------

Summarizing 1 Failure:
  [FAIL] E2E Test starting with non-empty Directory add Binding [It] should verify developer workflow of using binding as env in innerloop
  C:/Users/Administrator.ANSIBLE-TEST-VS/3620/tests/e2escenarios/e2e_test.go:306

Flaky E2E test (#6582)

/override windows-integration-test/Windows-test

[openshift-ci]

@rm3l: Overrode contexts on behalf of rm3l: windows-integration-test/Windows-test

In response to this:

 [FAILED] Expected
     <*url.Error | 0xc0002ac930>: {
         Op: "Post",
         URL: "http://127.0.0.1:64379/api/newuser",
         Err: <*errors.errorString | 0xc00008a130>{s: "EOF"},
     }
 to be nil
 In [It] at: C:/Users/Administrator.ANSIBLE-TEST-VS/3620/tests/e2escenarios/e2e_test.go:306 @ 04/05/23 03:05:44.82

 There were additional failures detected.  To view them in detail run ginkgo -vv
------------------------------

Summarizing 1 Failure:
 [FAIL] E2E Test starting with non-empty Directory add Binding [It] should verify developer workflow of using binding as env in innerloop
 C:/Users/Administrator.ANSIBLE-TEST-VS/3620/tests/e2escenarios/e2e_test.go:306

Flaky E2E test (#6582)

/override windows-integration-test/Windows-test

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[feloy]

/lgtm