Fix bad rent in Bank::deposit as if since epoch 0 (bp #10468)

[mergify]

This is an automated backport of pull request #10468 done by Mergify

Cherry-pick of 6c242f3 has failed:

On branch mergify/bp/v1.2/pr-10468
Your branch is up to date with 'origin/v1.2'.

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Changes to be committed:

	modified:   docs/src/implemented-proposals/rent.md
	modified:   runtime/src/bank.rs
	modified:   sdk/src/genesis_config.rs

Unmerged paths:
  (use "git add <file>..." to mark resolution)

	both modified:   runtime/src/accounts.rs
	both modified:   runtime/src/rent_collector.rs

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[mergify]

automerge label removed due to a CI failure

[codecov]

Codecov Report

Merging #11538 into v1.2 will increase coverage by 0.0%.
The diff coverage is 91.0%.

@@          Coverage Diff           @@
##            v1.2   #11538   +/-   ##
======================================
  Coverage   81.8%    81.8%           
======================================
  Files        319      319           
  Lines      76120    76172   +52     
======================================
+ Hits       62312    62374   +62     
+ Misses     13808    13798   -10