Update GitHub Actions

[martincostello]

Configure dependabot to also update the versions of GitHub Actions we use.

[codecov]

Codecov Report

Merging #1069 (4a39928) into main (78c576b) will decrease coverage by 33.27%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main    #1069       +/-   ##
===========================================
- Coverage   84.89%   51.62%   -33.28%     
===========================================
  Files         135      131        -4     
  Lines        3298     3192      -106     
===========================================
- Hits         2800     1648     -1152     
- Misses        498     1544     +1046     

Flag	Coverage Δ
linux	?
macos	51.62% <ø> (-0.07%)	⬇️
windows	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/JustSaying/Fluent/TopicAddressPublisher.cs	0.00% <0.00%> (-100.00%)	⬇️
...rc/JustSaying/Naming/NamingConventionExtensions.cs	0.00% <0.00%> (-100.00%)	⬇️
.../JustSaying/Fluent/SqsWriteConfigurationBuilder.cs	0.00% <0.00%> (-100.00%)	⬇️
...ustSaying/Messaging/MessageHandling/ListHandler.cs	0.00% <0.00%> (-100.00%)	⬇️
...tSaying/Fluent/QueueAddressPublicationBuilder`1.cs	0.00% <0.00%> (-100.00%)	⬇️
...aying/AwsTools/MessageHandling/SqsPolicyDetails.cs	0.00% <0.00%> (-100.00%)	⬇️
...ing/AwsTools/QueueCreation/ServerSideEncryption.cs	0.00% <0.00%> (-100.00%)	⬇️
...ng/AwsTools/QueueCreation/SqsWriteConfiguration.cs	0.00% <0.00%> (-100.00%)	⬇️
.../Fluent/ServiceResolver/CompoundServiceResolver.cs	0.00% <0.00%> (-100.00%)	⬇️
...t/PublishConfig/DynamicPublicationConfiguration.cs	0.00% <0.00%> (-100.00%)	⬇️
... and 52 more

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