fix: use python3.11 as base image #8348

Job	Run time
Validate Conventional Commit title	2s
Validate Conventional Commit title	5s
Build API Image / Build and verify flagsmith-api image	1m 38s
Build API Image / Build and verify flagsmith-api image	1m 38s
Build Frontend Image / Build and verify flagsmith-frontend image	1m 11s
Build Frontend Image / Build and verify flagsmith-frontend image	1m 11s
Build E2E Image / Build flagsmith-e2e image	34s
Build E2E Image / Build flagsmith-e2e image	34s
Build Unified Image / Build and verify flagsmith image	2m 32s
Build Unified Image / Build and verify flagsmith image	2m 32s
run-e2e-tests (segment-part-1 environment, 1) / E2E: segment-part-1 environment	7m 18s
run-e2e-tests (segment-part-1 environment, 1) / E2E: segment-part-1 environment	7m 18s
run-e2e-tests (segment-part-3 signup flag invite project, 2) / E2E: segment-part-3 signup flag invite project	4m 2s
run-e2e-tests (segment-part-3 signup flag invite project, 2) / E2E: segment-part-3 signup flag invite project	4m 2s
run-e2e-tests (segment-part-2, 1) / E2E: segment-part-2	7m 16s
run-e2e-tests (segment-part-2, 1) / E2E: segment-part-2	7m 16s
run-e2e-tests (versioning, 1) / E2E: versioning	3m 33s
run-e2e-tests (versioning, 1) / E2E: versioning	3m 33s
	56m 15s

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