Re-bump version codes for version 0.13 RC01 and test-only release (#5438)

## Explanation
This updates version codes for the 0.13 beta release of Oppia Android.
#5389 was made without an actual release taking place, and we've since
launched a test version of the app using release automation that used up
version code 151. Thus, this brings version codes 2 releases past
version code 151:
- The earlier version codes (-7 from the ones in this PR) will be used
for the 0.13 release.
- The current version codes will be used for a tester-only version of
the app to verify our QA tester installation process.

## Essential Checklist
- [ ] ~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 -- build infrastructure-only change.

Author: BenHenning

version.bzl

@@ -13,10 +13,10 @@ MAJOR_VERSION = 0
 MINOR_VERSION = 13
 
 # TODO(#4419): Remove the Kenya-specific alpha version code.
-OPPIA_DEV_VERSION_CODE = 117
-OPPIA_DEV_KITKAT_VERSION_CODE = 116
-OPPIA_ALPHA_KENYA_VERSION_CODE = 115
-OPPIA_ALPHA_VERSION_CODE = 114
-OPPIA_ALPHA_KITKAT_VERSION_CODE = 113
-OPPIA_BETA_VERSION_CODE = 112
-OPPIA_GA_VERSION_CODE = 111
+OPPIA_DEV_VERSION_CODE = 166
+OPPIA_DEV_KITKAT_VERSION_CODE = 165
+OPPIA_ALPHA_KENYA_VERSION_CODE = 164
+OPPIA_ALPHA_VERSION_CODE = 163
+OPPIA_ALPHA_KITKAT_VERSION_CODE = 162
+OPPIA_BETA_VERSION_CODE = 161
+OPPIA_GA_VERSION_CODE = 160