Bump version codes for Beta MR2 (#4705)

## Explanation
Bumps the minor version & APK version codes to prepare for the upcoming
beta MR2 release.

## 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 -- Version code-only change (doesn't affect user-facing
functionality).

version.bzl

@@ -7,13 +7,13 @@ their device qualifies for more than one choice.
 """
 
 MAJOR_VERSION = 0
-MINOR_VERSION = 9
+MINOR_VERSION = 10
 
 # TODO(#4419): Remove the Kenya-specific alpha version code.
-OPPIA_DEV_KITKAT_VERSION_CODE = 34
-OPPIA_DEV_VERSION_CODE = 35
-OPPIA_ALPHA_KITKAT_VERSION_CODE = 36
-OPPIA_ALPHA_VERSION_CODE = 37
-OPPIA_ALPHA_KENYA_VERSION_CODE = 38
-OPPIA_BETA_VERSION_CODE = 39
-OPPIA_GA_VERSION_CODE = 40
+OPPIA_DEV_KITKAT_VERSION_CODE = 41
+OPPIA_DEV_VERSION_CODE = 42
+OPPIA_ALPHA_KITKAT_VERSION_CODE = 43
+OPPIA_ALPHA_VERSION_CODE = 44
+OPPIA_ALPHA_KENYA_VERSION_CODE = 45
+OPPIA_BETA_VERSION_CODE = 46
+OPPIA_GA_VERSION_CODE = 47