Fix `TestIMDSAuth` test by increasing root volume size #2875

Job	Run time
Run test of provider shim	19m 14s
Run upstream provider-lint	37m 49s
comment-notification	0s
License Check / License Check	1m 46s
prerequisites / prerequisites	36m 12s
build_provider / Build linux-amd64	17m 29s
build_sdk / build_sdk (nodejs)	17m 59s
build_provider / Build linux-arm64	16m 56s
build_sdk / build_sdk (python)	18m 45s
build_sdk / build_sdk (dotnet)	20m 39s
build_sdk / build_sdk (go)	24m 29s
build_sdk / build_sdk (java)	9m 2s
build_provider / Build darwin-amd64	5m 21s
build_provider / Build darwin-arm64	18m 56s
build_provider / Build windows-amd64	17m 48s
provider_test (nodejs)	37m 57s
test_oidc (nodejs)	21m 46s
provider_test (python)	23m 45s
provider_test (dotnet)	18m 53s
test (nodejs, local)	1h 1m 32s
provider_test (go)	18m 17s
test (python, local)	28m 21s
provider_test (java)	25m 21s
test (dotnet, local)	19m 55s
test (go, local)	41m 53s
test (java, local)	18m 2s
sentinel	2s
	9h 38m 9s

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