all: rename interface{} to any

[jba]

All modules are on a Go version after 1.18, so we can rename
interface{} to any to modernize the code.

docstore is omitted, because there are PRs in flight that this might
conflict with (#3500, #3508).

[codecov]

Codecov Report

Attention: Patch coverage is 87.15596% with 28 lines in your changes missing coverage. Please review.

Project coverage is 73.26%. Comparing base (61f69d3) to head (5cd47b9).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pubsub/azuresb/azuresb.go	0.00%	10 Missing ⚠️
blob/memblob/memblob.go	16.66%	2 Missing and 3 partials ⚠️
pubsub/mempubsub/mem.go	42.85%	2 Missing and 2 partials ⚠️
blob/blob_fs.go	0.00%	3 Missing ⚠️
blob/driver/driver.go	50.00%	2 Missing ⚠️
blob/azureblob/azureblob.go	90.90%	1 Missing ⚠️
blob/fileblob/fileblob.go	87.50%	0 Missing and 1 partial ⚠️
samples/gocdk-runtimevar/main.go	50.00%	1 Missing ⚠️
samples/gocdk-secrets/main.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3515      +/-   ##
==========================================
- Coverage   73.26%   73.26%   -0.01%     
==========================================
  Files         113      113              
  Lines       15065    15065              
==========================================
- Hits        11038    11037       -1     
- Misses       3261     3262       +1     
  Partials      766      766              

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