Roll python 2 and 3 to versions matching the fleet.

R=ajp@chromium.org, tandrii@chromium.org, vadimsh@chromium.org

Change-Id: I8fe37755858f0b7205aa790dc4620e1ce0e84850
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1960695
Auto-Submit: Robbie Iannucci <iannucci@chromium.org>
Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>

bootstrap/manifest.txt

@@ -18,10 +18,10 @@
 $VerifiedPlatform windows-386 windows-amd64 linux-amd64 mac-amd64
 
 @Subdir python
-infra/python/cpython/${platform} version:2.7.15.chromium14
+infra/python/cpython/${platform} version:2.7.17.chromium.22
 
 @Subdir python3
-infra/python/cpython3/${os}-${arch=amd64} version:3.8.0b1.chromium.1
+infra/python/cpython3/${os}-${arch=amd64} version:3.8.0.chromium.8
 
 @Subdir git
 infra/3pp/tools/git/${os}-${arch} version:2.24.1.chromium.5

bootstrap/manifest_bleeding_edge.txt

@@ -18,10 +18,10 @@
 $VerifiedPlatform windows-386 windows-amd64 linux-amd64 mac-amd64
 
 @Subdir python
-infra/python/cpython/${platform} version:2.7.15.chromium14
+infra/python/cpython/${platform} version:2.7.17.chromium.22
 
 @Subdir python3
-infra/python/cpython3/${os}-${arch=amd64} version:3.8.0b1.chromium.1
+infra/python/cpython3/${os}-${arch=amd64} version:3.8.0.chromium.8
 
 @Subdir git
 infra/3pp/tools/git/${os}-${arch} version:2.24.1.chromium.5