fix(android): bump terra-android to 1.7.0 for health connect background delivery

[mep-y]

health connect background delivery fixes are missing from the flutter android bridge because it still pins co.tryterra:terra-android:1.6.3.

root cause: the flutter bridge already passes schedulerOn through, but the bundled native android sdk version predates the health connect background delivery changes in 1.7.0, including the background/history permissions and worker scheduling updates.

this changes the android dependency in android/build.gradle from 1.6.3 to 1.7.0 so flutter android integrations pick up the native health connect background delivery fix without changing bridge logic.

how to test:

• build the flutter plugin example on android and confirm gradle resolves co.tryterra:terra-android:1.7.0
• connect a health connect account with schedulerOn=true
• verify background delivery registration succeeds and auto-sync runs without requiring a foreground manual read

mep from ops investigation. needs engineering review.