Bump version to 3.12.0

[rm3l]

What type of PR is this:
/area release-eng

What does this PR do / why we need it:
cf $title

Which issue(s) this PR fixes:
Part of #6878

PR acceptance criteria:

• Unit test

• Integration test

• Documentation

How to test changes / Special notes to the reviewer:

[netlify]

🔨 Deploy Preview deleted from internal cluster!

Name	Link
🔨 Latest commit	3beeb6a
😎 Deploy Preview	https://odo-dev-pr-6935.odo-test-kubernete-449701-49529fc6e6a4a9fe7ebba9a3db5b55c4-0000.eu-de.containers.appdomain.cloud/

[odo-robot]

NoCluster Tests on commit finished successfully.
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OpenShift Unauthenticated Tests on commit finished with errors.
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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

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Kubernetes Docs Tests on commit 3bf5ffc finished successfully.
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[rm3l]

[...]
  > Add new environment variable
  ? What configuration do you want change? Add new environment variable
  ? Enter new environment variable name: DEBUG_PROJECT_PORT
  
  ======================
  Unexpected error:
      <*xpty.errPassthroughTimeout | 0xc001764010>: 
      passthrough i/o timeout
      {
          error: <*errors.errorString | 0xc001764000>{
              s: "passthrough i/o timeout",
          },
      }
  occurred
  In [It] at: /go/odo_1/tests/helper/helper_interactive.go:111 @ 06/27/23 15:14:34.676
------------------------------

Summarizing 1 Failure:
  [FAIL] odo init interactive command tests label unauth personalizing Devfile configuration [It] should allow for personalizing configurations [unauth]
  /go/odo_1/tests/helper/helper_interactive.go:111

Flaky issue with interactive tests - to be addressed in #6830

/override OpenShift-Integration-tests/OpenShift-Unauth-Integration-tests

[openshift-ci]

@rm3l: Overrode contexts on behalf of rm3l: OpenShift-Integration-tests/OpenShift-Unauth-Integration-tests

In response to this:

[...]
 > Add new environment variable
 ? What configuration do you want change? Add new environment variable
 ? Enter new environment variable name: DEBUG_PROJECT_PORT
 
 ======================
 Unexpected error:
     <*xpty.errPassthroughTimeout | 0xc001764010>: 
     passthrough i/o timeout
     {
         error: <*errors.errorString | 0xc001764000>{
             s: "passthrough i/o timeout",
         },
     }
 occurred
 In [It] at: /go/odo_1/tests/helper/helper_interactive.go:111 @ 06/27/23 15:14:34.676
------------------------------

Summarizing 1 Failure:
 [FAIL] odo init interactive command tests label unauth personalizing Devfile configuration [It] should allow for personalizing configurations [unauth]
 /go/odo_1/tests/helper/helper_interactive.go:111

Flaky issue with interactive tests - to be addressed in #6830

/override OpenShift-Integration-tests/OpenShift-Unauth-Integration-tests

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