Bump version codes for RC01 of Beta 0.12 (#5279)

## Explanation
Prepares for the upcoming release of Oppia Android Beta 0.12 RC01 by
bumping the version codes accordingly.

## Essential Checklist
<!-- Please tick the relevant boxes by putting an "x" in them. -->
- [ ] ~The PR title and explanation each start with "Fix #bugnum: " (If
this PR fixes part of an issue, prefix the title with "Fix part of
#bugnum: ...".)~
- [x] Any changes to
[scripts/assets](https://github.com/oppia/oppia-android/tree/develop/scripts/assets)
files have their rationale included in the PR explanation.
- [x] The PR follows the [style
guide](https://github.com/oppia/oppia-android/wiki/Coding-style-guide).
- [x] The PR does not contain any unnecessary code changes from Android
Studio
([reference](https://github.com/oppia/oppia-android/wiki/Guidance-on-submitting-a-PR#undo-unnecessary-changes)).
- [x] The PR is made from a branch that's **not** called "develop" and
is up-to-date with "develop".
- [x] The PR is **assigned** to the appropriate reviewers
([reference](https://github.com/oppia/oppia-android/wiki/Guidance-on-submitting-a-PR#clarification-regarding-assignees-and-reviewers-section)).

## For UI-specific PRs only
N/A -- this is an infrastructure-only change.

version.bzl

@@ -13,10 +13,10 @@ MAJOR_VERSION = 0
 MINOR_VERSION = 11
 
 # TODO(#4419): Remove the Kenya-specific alpha version code.
-OPPIA_DEV_VERSION_CODE = 103
-OPPIA_DEV_KITKAT_VERSION_CODE = 102
-OPPIA_ALPHA_KENYA_VERSION_CODE = 101
-OPPIA_ALPHA_VERSION_CODE = 100
-OPPIA_ALPHA_KITKAT_VERSION_CODE = 99
-OPPIA_BETA_VERSION_CODE = 98
-OPPIA_GA_VERSION_CODE = 97
+OPPIA_DEV_VERSION_CODE = 110
+OPPIA_DEV_KITKAT_VERSION_CODE = 109
+OPPIA_ALPHA_KENYA_VERSION_CODE = 108
+OPPIA_ALPHA_VERSION_CODE = 107
+OPPIA_ALPHA_KITKAT_VERSION_CODE = 106
+OPPIA_BETA_VERSION_CODE = 105
+OPPIA_GA_VERSION_CODE = 104