Bump mockery to v2.53.7 to unbreak unit-test on Go 1.27

[gustavodiaz7722]

Description of changes:

unit-test is currently failing on every PR, including unmodified main. It
fails in the mocks target, which make test depends on, so no test runs:

building mocks for pkg/types ...
internal error: package "k8s.io/apimachinery/pkg/apis/meta/v1" without types was imported from "github.com/aws-controllers-k8s/runtime/pkg/types"
make: *** [Makefile:24: mocks] Error 1

scripts/install-mockery.sh builds mockery from source with whatever Go the CI
image provides, and aws-controllers-k8s/test-infra#1084 moved go_version from
1.26.5 to 1.27.1 on 2026-09-02. mockery v2.53.3 pins
golang.org/x/tools v0.30.0, whose go/packages predates Go 1.27 and cannot
type-check its standard library, which is what produces the without types
loader error.

The timeline matches: the last unit-test run before the image bump passed
(PR #267, 2026-09-02T19:04Z), and runs after it fail.

v2.53.7 pins golang.org/x/tools v0.49.0, which handles Go 1.27.

The mocks are regenerated so the committed output matches the new version. The
only content changes are the generated-by header and import grouping — no mock
behaviour changes.

This also drops mocks/pkg/types/resolved_reference_manager.go. Its
ResolvedReferenceManager interface no longer exists in pkg/types, so mockery
does not generate it and nothing references it. It survived because the mocks
target overwrites files rather than starting from a clean directory, so a
make clean-mocks && make mocks cycle would otherwise always leave the tree
dirty.

Testing

Reproduced and verified locally against both Go versions, building mockery from
source exactly as the job does:

Go	mockery	make mocks
1.26.0	v2.53.3	passes
1.27.1	v2.53.3	fails with the error above
1.27.1	v2.53.7	passes

Under Go 1.27.1 with this change, all six mock sets generate and the full
go test ./... passes. I also confirmed v2.53.3 fails on unmodified main under
Go 1.27.1, so this is not specific to any open PR.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[michaelhtm]

/lgtm

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