chore(deps-dev): bump @types/jest to 26.0.4

[trivikr]

Issue #, if available:
Replacement for #1327

Description of changes:
bump @types/jest to 26.0.4

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[codecov-commenter]

Codecov Report

Merging #1334 into master will decrease coverage by 11.67%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master    #1334       +/-   ##
===========================================
- Coverage   89.34%   77.67%   -11.68%     
===========================================
  Files         152      286      +134     
  Lines        3145    11955     +8810     
  Branches      579     2623     +2044     
===========================================
+ Hits         2810     9286     +6476     
- Misses        335     2669     +2334     

Impacted Files	Coverage Δ
...ider-imds/src/remoteProvider/RemoteProviderInit.ts	100.00% <100.00%> (ø)
...edential-provider-imds/src/remoteProvider/retry.ts	100.00% <100.00%> (ø)
...aws-restjson/commands/GreetingWithErrorsCommand.ts	100.00% <0.00%> (ø)
protocol_tests/aws-restxml/endpoints.ts	82.14% <0.00%> (ø)
...sts/aws-query/commands/SimpleInputParamsCommand.ts	88.23% <0.00%> (ø)
.../commands/OmitsNullSerializesEmptyStringCommand.ts	88.23% <0.00%> (ø)
protocol_tests/aws-query/QueryProtocolClient.ts	92.30% <0.00%> (ø)
...tests/aws-query/commands/QueryTimestampsCommand.ts	88.23% <0.00%> (ø)
...ts/aws-query/commands/GreetingWithErrorsCommand.ts	100.00% <0.00%> (ø)
.../commands/OmitsNullSerializesEmptyStringCommand.ts	88.23% <0.00%> (ø)
... and 129 more

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